Camera Collision and Camera as radar.

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Ramon156

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Posted: 16th Mar 2012 17:57 Edited at: 16th Mar 2012 18:18

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Hello again, first of all thank you for putting your time and energy into helping me and possibly other people.
I have a few questions regarding to camera movement.

First some details about the game.

* My game is going to be in a third person view behind the player.
* The radar will be a camera positioned above the player, while being turned to the player/ground.

Question 1 : Camera Collision using sparkys DLL.

The command I'm using to detect collision is:
"SC_RayCastGroup"
Snippet of my RayCast code in the main loop.

I haven't used any variables yet, will do this when the code is fully functional.

+ Code Snippet

If sc_raycastgroup(0,Camera Position X(),Camera Position Y(),Camera Position Z(),object position x(1),object position y(1),object position z(1),1) => 1
    move camera 0,sc_getcollisiondistance()+1
Endif

The explanation of the command :

+ Code Snippet

return integer=SC_rayCastGroup ( groupNum, oldx, oldy, oldz, x, y, z, excludeObj ) 

-groupNum: the group you want to check for collision use 0 for all groups
-oldx...z: the start and end points of the ray to check.
-excludeObj: a single object to exclude from the collision check

returns: the object number collided with first is returned
returns 0 if no collision occured.

I'm using the SC_RayCast(Group) command also to for bullet handling, and it works flawless.

When there's an object between the player and the camera, the camera repositions but still lets parts of the object be seen.

When setting the value of
"move camera 0,sc_getcollisiondistance()+1"
to lets say, 10
"move camera 0,sc_getcollisiondistance()+10"

The camera repositions Distance * framerate wich makes the game unplayable.

I've tried using the SQRT command into a CameraDistance# variable to replace the SC_GetCollisionDistance like this :

+ Code Snippet

CameraDistance# = SQRT( (Object Position X(1)-Camera Position X())^2 + (Object Position Y(1)-Camera Position (Y))^2 + (Object Position Z(1)-Camera Position Z())^2)

If sc_raycastgroup(0,Camera Position X(),Camera Position Y(),Camera Position Z(),object position x(1),object position y(1),object position z(1),1) => 1
    move camera 0,CameraDistance# - CameraDistance +1
Endif

This does not work either and gives the same result.

How can I make the camera collision work properly?

Question 2 :

I have set up a second camera :

+ Code Snippet

Camera_Radar = 2
Make camera Camera_Radar
set camera view Camera_Radar,500,500,700,700
Angle = 0
Distance = 0
Height = 200
Smooth = 10
Collision = 0

Do

set camera to follow 2,Player.X,Player.Y,Player.Z,Angle,Distance,Height,Smooth,Collision
point camera 2,player.x,player.y,player.z

Loop

The code I'm using to move my character around using the mouse, and the WASD keys :
(It's from a tutorial)

+ Code Snippet

	
Rem Store Object angle Y in aY#
	aY# = Object angle Y(Player.Object)
	
	Rem get player object position and store in X# and Z#
	X# = Object position x(Player.Object)
	Z# = Object position z(Player.Object)
	
	Rem get new camera position and store in cZ# and cX#
	cZ# = Newzvalue(Z#,aY#-180,100)
	cX# = Newxvalue(X#,aY#-180,100)
	
	Set Camera To Follow Player.X,Player.Y,Player.Z,WrapValue(Object Angle Y(1)),100,20,15,0
	
	MMx = MouseMoveX()
	Y# = WrapValue(Object Angle Y(1)+MMx)
	Yrotate Object 1,Y#

And in a Gosub MovePlayer (From the Sparkys DLL Example)

+ Code Snippet

yrotate object Player.Object,object angle y(Player.Object)+mousemovex()/3.0


   if keystate(32)=1 then vx# = vx# + cos(angy#) : vz# = vz# - sin(angy#)
   if keystate(30)=1 then vx# = vx# - cos(angy#) : vz# = vz# + sin(angy#)
   if keystate(31)=1 then vx# = vx# - sin(angy#) : vz# = vz# - cos(angy#)
   if keystate(17)=1 then vx# = vx# + sin(angy#) : vz# = vz# + cos(angy#)

The camera is showing up in game at the specified coordinates on the screen, and it's showing my "character" from top view, wich is good.
However when I use the keys to walk, my camera "flips" around.
My guess is I need to somehow make this camera only follow the player, and not rotate around.

Ideas to help me out, shoot them please.

Also a side question :

I have a Limb in front of the player as weapon aim. It positions randomly to create a "real" effect for weapons not exactly shooting at where you aim.

+ Code Snippet

			PrimaryWeapon.SpreadX = RND(5)
			PrimaryWeapon.SpreadY = RND(5)

It's working but one little problem there.
If you slice the screen in half over the heigth and width you'll have 4 "squares", the limb only randomly places in the top right squares, or are my eyes betraying me?

+ Code Snippet

Rem - Weapon Range (Limb Offset)
If Player.ActivePrimary = 1
	WeaponRange = PrimaryWeapon.Range
	offset limb 1,1,PrimaryWeapon.SpreadX,PrimaryWeapon.SpreadY,WeaponRange
Endif
If Player.ActiveSecondary = 1
	WeaponRange = SecondaryWeapon.Range
	Offset limb 1,1,SecondaryWeapon.SpreadX,SecondaryWeapon.SpreadY,WeaponRange
Endif

Thanks again for your time, I will be posting a video tonight showing my problems to make them more clear.

Also any comments to create my ideas in a different way are much appreciated.

Watch my problems in High Def on
http://www.youtube.com/watch?v=EkEG1qSIGz0&feature=youtu.be

Hi 5!

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29 games

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Posted: 18th Mar 2012 19:34

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Hi Ramon

I've had a look at this and think I can answer all your questions:

Quesiton 1:

Quote: "When there's an object between the player and the camera, the camera repositions but still lets parts of the object be seen."

Rather than using a ray cast for camera collision I use a sphere cast, as it keeps the camera away from any objects that it has collided making it easier to deal with the problem you have mentioned

Question 2:

Quote: "...when I use the keys to walk, my camera "flips" around"

If you're using the object y angle to get the angle you want your camera then this will happen due to how DBP rotates objects. Run this code (a spinning cube) and look at what happens to the object's angles.

+ Code Snippet

sync on
sync rate 60

make object cube 1, 10

do

	turn object left 1, 1
	
	set cursor 0,0
	print "object angle x : ", object angle x(1)
	print "object angle y : ", object angle y(1)
	print "object angle z : ", object angle z(1)

	sync

loop

The y angle goes from -90 to 90 degrees and the other angles flip between 0 and 180. This still visually looks the same on the screen but obviously messes with any code using just the y angle. For third and first person stuff, I normally use variables to control the angles.

Below is a demo of how I would do what you are trying to do.

`basic setup
sync on
sync rate 60
hide mouse
autocam off
randomize timer()

`make a second camera and set the position and size so that it has the same aspect ratio as the screen
make camera 2
set camera view 2, 0,0,screen width()/5, screen height()/5

`make a matrix floor
make matrix 1, 1000,1000,10,10

`make a green box for the player
make object box 1, 5,10,5
color object 1, rgb(0,250,00)
position object 1, -30,5,-30

`make ten red boxes and place at randoms positions to act as the map
for i = 2 to 11
	make object cube i, 30
	color object i, rgb(200,0,0)
	position object i,rnd(1000),15,rnd(1000)
	turn object left i, rnd(90)
	
	`set up collision and place all the boxes in the same collision group
	SC_setupObject i, 1, 0
next i

`this variable holds the direction that the player is facing in
facing# = 0

`main loop
do

`player controls 
	if upkey() = 1 then move object 1, 3
	if downkey() = 1 then move object 1,-3
	if rightkey() = 1 then facing# = wrapvalue(facing# + 1.0)
	if leftkey() = 1 then facing# = wrapvalue(facing# - 1.0)

`rotate the player	
	yrotate object 1, facing#

`get the player position
	ply_x# = object position x(1)
	ply_y# = object position y(1)
	ply_z# = object position z(1)

`this next block of code positions that camera behind the player
	position camera ply_x#, ply_y#+15, ply_z#	:`position the main camera a little bit above the player
	rotate camera 0,0,0							:`set the camera rotation to zero
	turn camera right facing#					:`turn the camera to the same facing as the player
	pitch camera down 5							:`tilt the camera down a bit (or use your onw look up / look down code to do this bit)
	move camera -50								:`move the camera backward

`get the camera's position
	cam_x# = camera position x()
	cam_y# = camera position y()
	cam_z# = camera position z()

`sphere cast betwen the player and the camera current position
	if SC_sphereSlideGroup(1, ply_x#,ply_y#,ply_z#, cam_x#,cam_y#,cam_z#, 3, 0) <> 0
		`if the sphere cast destect a collision, reposition the camera at the point of collision
		`note that for sphere casting this will be the centre of the sphere and not where the sphere
		`touches the red box
		position camera SC_getStaticCollisionX(), SC_getStaticCollisionY(), SC_getStaticCollisionZ()
	endif

`position and point the second camera at the player to act as a radar
	position camera 2, ply_x#,ply_y#+100,ply_z#			:`position 100 units above the player
	point camera 2, ply_x#,ply_y#,ply_z#				:`point the camera at the player
	yrotate camera 2, facing#							:`rotate the camera so that the the view is orientated to the main screen view

sync

loop

+ Code Snippet

`basic setup
sync on
sync rate 60
hide mouse
autocam off
randomize timer()

`make a second camera and set the position and size so that it has the same aspect ratio as the screen
make camera 2
set camera view 2, 0,0,screen width()/5, screen height()/5

`make a matrix floor
make matrix 1, 1000,1000,10,10

`make a green box for the player
make object box 1, 5,10,5
color object 1, rgb(0,250,00)
position object 1, -30,5,-30

`make ten red boxes and place at randoms positions to act as the map
for i = 2 to 11
	make object cube i, 30
	color object i, rgb(200,0,0)
	position object i,rnd(1000),15,rnd(1000)
	turn object left i, rnd(90)
	
	`set up collision and place all the boxes in the same collision group
	SC_setupObject i, 1, 0
next i

`this variable holds the direction that the player is facing in
facing# = 0

`main loop
do

	`player controls 
	if upkey() = 1 then move object 1, 3
	if downkey() = 1 then move object 1,-3
	if rightkey() = 1 then facing# = wrapvalue(facing# + 1.0)
	if leftkey() = 1 then facing# = wrapvalue(facing# - 1.0)

	`rotate the player	
	yrotate object 1, facing#	

	`get the player position
	ply_x# = object position x(1)
	ply_y# = object position y(1)
	ply_z# = object position z(1)

	`this next block of code positions that camera behind the player
	position camera ply_x#, ply_y#+15, ply_z#	:`position the main camera a little bit above the player
	rotate camera 0,0,0							:`set the camera rotation to zero
	turn camera right facing#					:`turn the camera to the same facing as the player
	pitch camera down 5							:`tilt the camera down a bit (or use your onw look up / look down code to do this bit)
	move camera -50								:`move the camera backward

	`get the camera's position
	cam_x# = camera position x()
	cam_y# = camera position y()
	cam_z# = camera position z()

	`sphere cast betwen the player and the camera current position
	if SC_sphereSlideGroup(1, ply_x#,ply_y#,ply_z#, cam_x#,cam_y#,cam_z#, 3, 0) <> 0
		`if the sphere cast destect a collision, reposition the camera at the point of collision
		`note that for sphere casting this will be the centre of the sphere and not where the sphere
		`touches the red box
		position camera SC_getStaticCollisionX(), SC_getStaticCollisionY(), SC_getStaticCollisionZ()
	endif

	`position and point the second camera at the player to act as a radar
	position camera 2, ply_x#,ply_y#+100,ply_z#			:`position 100 units above the player
	point camera 2, ply_x#,ply_y#,ply_z#				:`point the camera at the player
	yrotate camera 2, facing#							:`rotate the camera so that the the view is orientated to the main screen view

	sync 

loop

Bonus Question:

Quote: "I have a Limb in front of the player as weapon aim. It positions randomly to create a "real" effect for weapons not exactly shooting at where you aim."

Your random function only returns positive values, 0 thru 5, so it terms of the limb offset this to the right (x offset) and up (y offset). If you want it to go both left and right and up and down you need to have a "equation" that give values from negative to positive, with negative values offsetting the limb to the left and down, something like:

offset = rnd(10) - 5

which will give values from -5 thru 5.

Hope this is what you were after

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Ramon156

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Posted: 19th Mar 2012 15:46 Edited at: 19th Mar 2012 15:49

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Hi 29 games, thank you for your response.

The camera is working.

+ Code Snippet

   Rem - Player Object Position
   ObjPosX# = Object Position X(1)
   ObjPosY# = Object Position Y(1)
   ObjPosZ# = Object Position Z(1)
   
   Rem - Player Object Angle
   ObjAngX# = Object Angle x(1)
   ObjAngY# = Object Angle y(1)
   ObjAngZ# = Object Angle z(1)
   
   Rem - Rotate With Mouse
   yrotate object 1,ObjAngY#+mousemovex()/3.0 `Rotate Object On X-Axis (Left-Right) `Up and Down movement with the mouse is not needed (yet).

   
   Rem - Position Player Camera
   position camera ObjPosX#,ObjPosY#+60,ObjPosZ#
   rotate camera ObjAngX#,ObjAngY#,ObjAngZ#
   move camera -70
   pitch camera down 30
   
   Rem - Position (Map/Radar) Camera.
   Position Camera 2, ObjPosX#,ObjPosY#+200,ObjPosZ#
   point camera 2, ObjPosX#,ObjPosY#,ObjPosZ#
   Yrotate camera 2,ObjAngY#

It's a bit different as your code, but it works like it should.
Mouse is used to rotate, WASD to move / strafe.

The random limb positioning works good now, I didn't know it was possible to do it like that.

RND(10) - 5
This range is from -5 to 5. I've been using RND(10)-10 myself before I asked for help *Slaps forehead*.

The camera collision is not working like it should when using your code.
It is not going through objects, but SC_SphereCastGroup seems to work better than SC_SphereSlide, is that a mistake from your side or am I doing something wrong?
To clear things up, this is the code I'm using now wich gives the best collision :

+ Code Snippet

   	if SC_SphereCastGroup(1, ObjPosX#,ObjPosY#,ObjPosZ#, Cam_PosX#,Cam_PosY#,Cam_PosZ#, 5, 0) <> 0
		position camera SC_getStaticCollisionX(), SC_getStaticCollisionY(), SC_getStaticCollisionZ()
	endif

Thank you for your help.

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Posted: 27th Mar 2012 01:32

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Glad you got your code working.

Quote: "_SphereCastGroup seems to work better than SC_SphereSlide, is that a mistake from your side or am I doing something wrong?"

No, this way my mistake and I seemed to have made the same mistake in the game I'm writing at the moment so thanks for flagging it up, I might not have spotted it otherwise.

Anyway, as I said, I'm glad you got it working.

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Ramon156

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Posted: 3rd Apr 2012 16:57

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Thank you 29 games for your help.

On my youtube page is a video of how its currently working.

http://www.youtube.com/watch?v=EkEG1qSIGz0&feature=youtu.be

Also I'm trying to make the following and I don't want to open a new topic again.

Camera is top view , following the player.
The objects in the level that cannot be seen by the camera should hide and unhide accordingly to collision with a box attached to the player.
This is to optimize the game and make it run smoother.

Let's say my camera "view" is 200x200.
I'd make a box attached to the player that's 800x800 wich is my "fadecheck".
Everything colliding with the fadecheck box => 1 should unhide (this would be seen by the camera).

Everything colliding with the fadecheck box =< 0 should hide (Wich is not to be seen by the camera)

This is only if , hiding objects would speed up the game.

Now I've made a for-next-loop in my main loop (Wich will be put into a function later, if working correctly).
This loop will be something like

+ Code Snippet

For X = 0 to Maxobjects

If object exist (X) = 0 then exit

If object exist(X) = 1
If object collision (Fadecheck,X) => 1
Unhide Object X
Else
Hide Object X
Endif

This however does not work.

The fadecheck box is following the player, objects are not hiding or unhiding (I've made about 20 boxes to test it)

There would be also a way of checking the distance from the player to each object, if there's 1000 objects there would be 1000 distance checks each frame x 60FPS = 60.000 checks each second.
Same goes for the for-next-loop, 60.000 checks per second.

How can I make this work, or is there maybe an easier way to accomplish this?

Thank you

Btw 29 games do you have a video or some screenies of your game?

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Posted: 3rd Apr 2012 17:58 Edited at: 3rd Apr 2012 18:04

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+ Code Snippet

Rem - Make a collision box to check for fading
FadeBox = 183
Make Object Box FadeBox,150,150,150
hide object FadeBox


do

Position Object FadeBox, Player.X,Player.Y,Player.Z

For X = 1 to 180
		
If Object Exist (X) = 1
	If Object Collision (FadeBox,X) = 0
		Hide Object X
	Endif
			
	If Object Collision (FadeBox,X) = 1
		show object X
	Endif
Endif

Next X

sync
loop

It seems that I got the idea working like this with DBPro code.
Objects hide and show according to collision with the fadebox.

Now I would only need to stranslate this into sparkys DLL code wich I will try for myself first.

I have no idea why my first pieces of code didn't work as they gave me "Object does not exist" errors.

Does it have to do with
"If object exist = 0 then exit"

Loop starts counting: 1,2,3,4
Object Number 5 does not exist
It exits the FOR loop, completes the DO loop, starts the DO loop again, comes at the FOR loop but instead of starting at 5 to check, it starts at 1 again, resulting in errors or objects not using the collision command.

Would this be the way to do it :
"If object exist = 0 then next X"

Sorry for double posting!

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Posted: 5th Apr 2012 01:57 Edited at: 10th Apr 2012 02:15

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Personally I would change this:

+ Code Snippet

If Object Exist (X) = 1
	If Object Collision (FadeBox,X) = 0
		Hide Object X
	Endif
			
	If Object Collision (FadeBox,X) = 1
		show object X
	Endif
Endif

To this:

+ Code Snippet

If Object Exist (X) = 1
	If Object Collision (FadeBox,X) = 0
		Hide Object X
	else
		show object X
	Endif
Endif

The other thing I tend to do is assign variables for all the object ident numbers so I don't have to do the "If Object Exist" bit.

Edit: I somehow managed to delete the part where all the crates are added in, this has now been added

sync on
sync rate 60
randomize timer()
hide mouse

num_objects = 0

`make an object for the player
inc num_objects
player_id = num_objects
make object cube player_id, 20
color object player_id, rgb(0,250,0)

`I somehow managed to delete this bit out before I posted it the first time
`make some crates (i.e. cubes)
number_of_crates = 10
dim crate_id(number_of_crates)
for i = 1 to number_of_crates
	inc num_objects
	crate_id(i) = num_objects
	make object cube crate_id(i),20
	position object crate_id(i), rnd(500),10,rnd(500)
next i

`use a matrix to act as a ground
make matrix 1, 500,500,10,10

do

`move player
	if upkey() = 1 then move object player_id, 2
	if downkey() = 1 then move object player_id, -2
	if rightkey() = 1 then turn object right player_id, 1
	if leftkey() = 1 then turn object left player_id, 1

`check collision
	`this bit of code will work exactly the same as your "hide / unhide code"
	for i = 1 to number_of_crates
		if object collision(player_id, crate_id(i)) = 1
			color object crate_id(i), rgb(255,0,0)
		else
			color object crate_id(i), rgb(255,255,255)
		endif
	next i

set cursor 0,0
	print "use the arrow keys to drive the green box"
	print "if you hit the white 'crates' they will turn red"

position camera 250,500,250
	point camera 250,0,250

sync

loop

+ Code Snippet

sync on
sync rate 60
randomize timer()
hide mouse

num_objects = 0

`make an object for the player
inc num_objects
player_id = num_objects
make object cube player_id, 20
color object player_id, rgb(0,250,0)


`I somehow managed to delete this bit out before I posted it the first time
`make some crates (i.e. cubes)
number_of_crates = 10
dim crate_id(number_of_crates)
for i = 1 to number_of_crates
	inc num_objects
	crate_id(i) = num_objects
	make object cube crate_id(i),20
	position object crate_id(i), rnd(500),10,rnd(500)
next i


`use a matrix to act as a ground
make matrix 1, 500,500,10,10


do

	`move player
	if upkey() = 1 then move object player_id, 2
	if downkey() = 1 then move object player_id, -2
	if rightkey() = 1 then turn object right player_id, 1
	if leftkey() = 1 then turn object left player_id, 1

	`check collision
	`this bit of code will work exactly the same as your "hide / unhide code"
	for i = 1 to number_of_crates
		if object collision(player_id, crate_id(i)) = 1
			color object crate_id(i), rgb(255,0,0)
		else
			color object crate_id(i), rgb(255,255,255)
		endif
	next i

	set cursor 0,0
	print "use the arrow keys to drive the green box"
	print "if you hit the white 'crates' they will turn red"	

	position camera 250,500,250
	point camera 250,0,250

	sync

loop

Instead of using the "num_objects" variable, I believe there is a command in one of the plug-ins that will find a free object id number for you. It works out to be the same. What you will notice, is that it's very easy to change the number of crates (just change the value for "number_of_crates" variable) and to add new objects in. So if you added in:

+ Code Snippet

`make some cones
number_of_cones = 10
dim cone_id(number_of_cones)
for i = 1 to number_of_cones
	inc num_objects
	cone_id(i) = num_objects	
	make object cone cone_id(i), 20
	color object cone_id(i), rgb(255,255,0)
	position object cone_id(i), rnd(500),0,rnd(500)
next i

afte the block of code that generates the crates, then you've added a whole bunch more ojects without having to worry if object numbers have already been used.

Quote: "There would be also a way of checking the distance from the player to each object, if there's 1000 objects there would be 1000 distance checks each frame x 60FPS = 60.000 checks each second.
Same goes for the for-next-loop, 60.000 checks per second"

You could restrict the number of checks to, say, every fifth or tenth loop. When you think about it at 60 fps, a frame is only on screen for about 17 milliseconds so the player probably would notice anything. If you did a check every 5th loop, then you'd reduce the number of checks a second from 60,000 to 12,000 per second. I reckon you could do the check once every tenth of a second and no one would notice. However, objects would be on screen for longer so you'd have to play around with the optimim amount of checks per second. I tend to find that the number of polys / models on screen seems to have a higher impact than number of collision checks but this is something you need to play around with.

Quote: "Btw 29 games do you have a video or some screenies of your game?"

Not yet.

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Ramon156

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Posted: 10th Apr 2012 01:24

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Ok I know how to implement this into my projects.
But I just don't understand how it works.

Does "num_objects = 0" keep increasing every time you make an object?

When I print the variable to the screen it returns 0 , even after creating 4 "For next loops" who each make 1000 boxes.

Is this something DBPro handles in a dark back alley so I don't have to worry about it?

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Posted: 10th Apr 2012 02:22 Edited at: 10th Apr 2012 02:23

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Hi, I somehow managed to screw up one of the code snippets I posted. I've edited the code (the third one) and now it creates some white cubes (crates) that will turn red when you drive the green box into them.

Yes, the "num_objects" variable is being incremented everytime I make an object. Each object then has its own id in the form of a variable that has the current value of "num_object" written to it. Hopefully, this should now be clearer from the edited code snippet.

It's just a method I use for object management and stops me from accidentally using the same object number more than once. When you have all your object id number in variables, it makes them easier to reference in your code. I also find this method handy if I have to delete objects, say when deleting a level and loading a new level in I can just use a simple FOR...TO...NEXT loop to delete everything. Ie:

For i = 1 to num_objects
delete object i
next i

and I'll know the object exists without having to check first.

People do different things. The exact method you'll end up using may depend on how many different types of object you are loading. The FIND FREE OBJECT command is part of Ian M's Matrix1Utils plugins collection, which can be found here:

http://forum.thegamecreators.com/?m=forum_view&t=85209&b=18

This way you could do something like (you'll need the plugin to run the code but have a look at the section where the objects are being loaded in):

sync on
sync rate 60
randomize timer()
hide mouse

`make an object for the player
player_id = find free object()
make object cube player_id, 20
color object player_id, rgb(0,250,0)

`make some crates (i.e. cubes)
number_of_crates = 10
dim crate_id(number_of_crates)
for i = 1 to number_of_crates
	crate_id(i) = find free object()
	make object cube crate_id(i),20
	position object crate_id(i), rnd(500),10,rnd(500)
next i

`use a matrix to act as a ground
make matrix 1, 500,500,10,10

do

`move player
	if upkey() = 1 then move object player_id, 2
	if downkey() = 1 then move object player_id, -2
	if rightkey() = 1 then turn object right player_id, 1
	if leftkey() = 1 then turn object left player_id, 1

`check collision
	`this bit of code will work exactly the same as your "hide / unhide code"
	for i = 1 to number_of_crates
		if object collision(player_id, crate_id(i)) = 1
			color object crate_id(i), rgb(255,0,0)
		else
			color object crate_id(i), rgb(255,255,255)
		endif
	next i

set cursor 0,0
	print "use the arrow keys to drive the green box"
	print "if you hit the white 'crates' they will turn red"

position camera 250,500,250
	point camera 250,0,250

sync

loop

+ Code Snippet

sync on
sync rate 60
randomize timer()
hide mouse

`make an object for the player
player_id = find free object()
make object cube player_id, 20
color object player_id, rgb(0,250,0)

`make some crates (i.e. cubes)
number_of_crates = 10
dim crate_id(number_of_crates)
for i = 1 to number_of_crates
	crate_id(i) = find free object()
	make object cube crate_id(i),20
	position object crate_id(i), rnd(500),10,rnd(500)
next i


`use a matrix to act as a ground
make matrix 1, 500,500,10,10


do

	`move player
	if upkey() = 1 then move object player_id, 2
	if downkey() = 1 then move object player_id, -2
	if rightkey() = 1 then turn object right player_id, 1
	if leftkey() = 1 then turn object left player_id, 1

	`check collision
	`this bit of code will work exactly the same as your "hide / unhide code"
	for i = 1 to number_of_crates
		if object collision(player_id, crate_id(i)) = 1
			color object crate_id(i), rgb(255,0,0)
		else
			color object crate_id(i), rgb(255,255,255)
		endif
	next i

	set cursor 0,0
	print "use the arrow keys to drive the green box"
	print "if you hit the white 'crates' they will turn red"	

	position camera 250,500,250
	point camera 250,0,250

	sync

loop

And if you wanted to add some different objects in you would just add in:

+ Code Snippet

`make some cones
number_of_cones = 10
dim cone_id(number_of_cones)
for i = 1 to number_of_cones
	cone_id(i) = find free object()
	make object cone cone_id(i), 20
	color object cone_id(i), rgb(255,255,0)
	position object cone_id(i), rnd(500),0,rnd(500)
next i

at any point before the start of the DO...LOOP. The reason I don't use the FIND FREE OBJECT command is that I've only recently downloaded and intalled the plugin, that and I like to work things out for myself using the native DBP command set (I find this is a good way to learn stuff).

What you need to do is work out how you want to manage all your object id numbers, and the id numbers for the rest of the media you'll be loading in. It's quite scary how quickly it all becomes unmanagable if you haven't thought about it at an early stage.

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Ramon156

13

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Joined: 13th Jul 2011

Location: Netherlands

Posted: 10th Apr 2012 14:10

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Hi 29 Games!
I've made a typo in my code. Used "numer" instead of "number"!
That was the reason for not having it printed on my screen. Didn't gave me an error but appearently every variable thats typed wrong just returns 0!

I have the same reason for skipping plugins, except for sparkys but that's more due to a lack of math knowledge.
I've been using DBPro in a good way since feb this year, learning quickly but also think in a too difficult kind of way to make functions and so on.

That plugin(page) looks good though.

Is there a reason why you're using only an array to store the ID?

+ Code Snippet

Type Object_ID
NPC as integer
Enemy as integer
WORLD as integer
EndType

Number_Of_Objects = 0
Inc Number_Of_Objects

Dim Object_ID(Number_Of_Objects) as Object_ID

Number_Of_NPCS = 20
For i = 1 to Number_Of_NPCS
inc Number_Of_Objects
Object_ID(i).NPC = Number_Of_Objects
Make object box Object_ID(i).NPC,25,25,25
Position Object Object_ID(i).NPC 25*i,0,0
Next i

I use this same method for the NPCS spawning in my other post (Type Arrays)
And the part where I look for a new waypoint fails dramatically, maybe due to type arrays.

Thank you for help and making my object creation allot easier.

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29 games

18

Years of Service

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Joined: 23rd Nov 2005

Location: not entirely sure

Posted: 10th Apr 2012 21:09

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The reason I only used a basic array on the examples was that there was no need to store any other information about the object other than its id, so setting up a type might be a bit of an overkill.

If there are other stats associated with the object, such as a npc where you may have health, speed, strength etc, then arrays are the way to go. However, simillar to the issue you raised, I currently have the way point array seperate from the npc array / type as I have a single dimension array for the npc, associated with a UDT and a multi-dimensional array for the way points, and I don't know enough about UDTs to be able to hook them together (if it's at all possible).

Don't feel bad about using Sparky's. I've done a lot of maths collision in DBC and the maths is difficult and the end result is slow. It's a brilliant learning exercise but the end result is not really worth the hassle.

I believe that Ian M's matrix utility plugin in very useful and I'll be having a look at it. More pluggins can be found on a sticky at the top of the program announcement board of you're interested, there's a 2D one that's supposed to be quite good.

Anyway, glad you're moving on with your game.

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RonsWare

14

Years of Service

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Joined: 5th Sep 2010

Location: Netherlands

Posted: 12th Apr 2012 08:57

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Ga zo door ziet er goed uit.

Programming is learning

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