3d Camera problems - GameCreators Forum

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kamac

15

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Joined: 30th Nov 2010

Location: Poland

Posted: 17th Dec 2010 17:39

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Okay, so i started 3d tests with simple racer game, and i dont know how to make camera follow my player

.

The code:

+ Code Snippet

Rem Project: Racer
Rem Created: Friday, December 17, 2010

Rem ***** Main Source File *****

`loading objects
load object "media\rm_map.x",1
load image "media\rm_txt.bmp",1
load object "media\racer.x",2

`positioning player & scaling & rotating
scale object 2,30,30,30
position object 2,-3,0.1,0
rotate object 2,0,90,0

`texturing
texture object 1,1

`main loop, trying to make camera follow
Do
	X = Limb Position X(2,1)
	Y = Limb Position Y(2,2)
	Z = Limb Position Z(2,3)
	`control camera using arrowkeys 0,0.001,0.01
	set camera to follow 1,2,3,0,2,0.5,1,0
Loop

Thanks!

Cheers!

~Kamac

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kamac

15

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Joined: 30th Nov 2010

Location: Poland

Posted: 17th Dec 2010 19:13

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I solved making it follow, but i have no idea how to make it go behind the player, when he's rotating :S.

Cheers!

~Kamac

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Hodgey

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Joined: 10th Oct 2009

Location: Australia

Posted: 18th Dec 2010 10:22

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Hi, try this

Rem ***** Main Source File *****
// set a refresh rate
sync on : sync rate 60

// get random numbers each time
randomize timer()

// make the player
make object sphere 1,50

// make scenery
for n = 2 to 6
    make object cube n,100
    position object n, rnd(600), 0, rnd(400)
next

// camera position
camx as float = 0.0
camy as float = 30.0
camz as float = -10.0

// distance between object and camera
distance as float = 70.0

// the angle of the object
angle as float = 0.0

// main loop
do
    
    // move the object
    if upkey()=1 then move object 1, 1
    if downkey()=1 then move object 1,-1
    
    // rotate the object
    if rightkey()=1 then angle = wrapvalue(angle + 1.0)
    if leftkey()=1 then angle = wrapvalue(angle - 1.0)
    yrotate object 1, angle
    
    // poisition the camera according the the player's coordinates and rotation
    camx = (-sin(angle)*distance)+object position x(1)
    camz = (-cos(angle)*distance)+object position z(1)
    position camera camx, camy, camz
    
    // point the camera towards the player
    point camera object position x(1), object position y(1), object position z(1)
    
    // refresh
    sync
loop

+ Code Snippet

Rem ***** Main Source File *****
// set a refresh rate
sync on : sync rate 60

// get random numbers each time
randomize timer()

// make the player
make object sphere 1,50

// make scenery
for n = 2 to 6
    make object cube n,100
    position object n, rnd(600), 0, rnd(400)
next

// camera position
camx as float = 0.0
camy as float = 30.0
camz as float = -10.0

// distance between object and camera
distance as float = 70.0

// the angle of the object
angle as float = 0.0

// main loop
do
    
    // move the object
    if upkey()=1 then move object 1, 1
    if downkey()=1 then move object 1,-1
    
    // rotate the object
    if rightkey()=1 then angle = wrapvalue(angle + 1.0)
    if leftkey()=1 then angle = wrapvalue(angle - 1.0)
    yrotate object 1, angle
    
    // poisition the camera according the the player's coordinates and rotation
    camx = (-sin(angle)*distance)+object position x(1)
    camz = (-cos(angle)*distance)+object position z(1)
    position camera camx, camy, camz
    
    // point the camera towards the player
    point camera object position x(1), object position y(1), object position z(1)
    
    // refresh
    sync
loop

A clever person solves a problem, a wise person avoids it - Albert Einstein

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Sph!nx

17

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Joined: 3rd Dec 2008

Location: The Netherlands

Posted: 18th Dec 2010 11:32 Edited at: 18th Dec 2010 11:33

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Well, I think it's best to regard the camera as a separate object, like the player or an enemy.

Simply code it so that it follows the player and act properly. This will give you much more freedom. You could have the camera interact with the walls and ceilings when you are inside (move closer to player when colliding or something) or detach the camera for cool looking cut-scenes!

Not really code help here. Just my two cents.

Regards,
Sph!nx

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kamac

15

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Joined: 30th Nov 2010

Location: Poland

Posted: 18th Dec 2010 11:45

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Thanks Hodgey

PS. Do you remember these lines?

+ Code Snippet

   camx = (-sin(angle)*distance)+object position x(1)
    camz = (-cos(angle)*distance)+object position z(1)

or wrote them from sample

? They seem a little hard to me, i mean, i know what's sinus and cosinus but... lol

Cheers!

~Kamac

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kamac

15

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Joined: 30th Nov 2010

Location: Poland

Posted: 18th Dec 2010 12:00

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Oh, sorry for double-post and question which is probably being asked twice a minute. Is there any way for perfect polygon collision? I have the map made in wings 3d, it includes floor and walls. Its like a box without the top, like:
|_| and the normal box has the top over the _

. Well, when i try to detect the collision that way, it just simply cannot be done, because DBPro doesn't see that there is a space between four walls

|X| on X is free space

, which he doesnt see

Cheers!

~Kamac

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Kira Vakaan

17

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Joined: 1st Dec 2008

Location: MI, United States

Posted: 18th Dec 2010 20:17

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Quote: "PS. Do you remember these lines?
camx = (-sin(angle)*distance)+object position x(1)
camz = (-cos(angle)*distance)+object position z(1)
or wrote them from sample ? They seem a little hard to me, i mean, i know what's sinus and cosinus but... lol "

Those lines simply calculate the position of the point that is "distance" units behind object 1's location, based on which way the object is facing. I would recommend getting comfortable with that kind of math. I can only make your life easier, and you'll probably encounter it frequently in your game development career. However, DBPro provides some simple functions to take care of simple trig like that for you. You can replace those lines with this:

+ Code Snippet

   camx = newxvalue(object position x(1), angle, -distance)
   camz = newzvalue(object position z(1), angle, -distance)

These lines do exactly the same thing, and are easier on the eyes for trig beginners, but they will become limiting when you need to do more complex things.

As for your collision problem, it sounds like DBPro is either trying to use box collision on the map, or your face normals are backwards. But, assuming that you can actually see the walls and floor while you are inside the box, it is probably not a normal problem as they would've been culled by DBPro.

Since you have a collision issue, I'm sure someone around here is going to suggest getting Sparky's DLL, which I highly recommend myself, but I think it's important that you figure out what you were trying to use first. How are you setting up your collision?

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kamac

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Joined: 30th Nov 2010

Location: Poland

Posted: 18th Dec 2010 21:36

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I am setting it up by commands:

+ Code Snippet

SET OBJECT COLLISION TO POLYGONS 1
SET OBJECT COLLISION TO POLYGONS 2
SET GLOBAL COLLISION ON
(...)
If object collision(1,2) Then (...)

That's it, but it seems like DBPro see's the map as a box.

Cheers!

~Kamac

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Kira Vakaan

17

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Joined: 1st Dec 2008

Location: MI, United States

Posted: 18th Dec 2010 22:51

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Try removing set global collision on. I think that command tells DBPro to do what it thinks is best, regardless of what you told it to do previously.

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kamac

15

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Joined: 30th Nov 2010

Location: Poland

Posted: 19th Dec 2010 08:19

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It still doesnt work

here's the full code:

Rem Project: Racer
Rem Created: Friday, December 17, 2010

Rem ***** Main Source File *****

`loading objects
load object "media\rm_map.x",1
load object "media\racer.x",2
load object "media\coin.x",3
load image "media\coin.bmp",3

`positioning player & scaling & rotating
scale object 2,30,30,30
position object 2,-3,0.3,0
scale object 3,25,25,25

position object 3,0,0.3,1

`texturing
texture object 3,3

`vars

camx as float = 0.0
camy as float = 2.0
camz as float = -10.0

// distance between object and camera
distance as float = 2.0

// the angle of the object
angle as float = 0.0

rotation# = 0

set object collision to polygons 1
set object collision to polygons 2

Do
	rotation# = rotation# + 0.2
	`object position X/Y/Z
    if InKey$()="d" then angle = wrapvalue(angle + 0.1)
    if Inkey$()="a" then angle = wrapvalue(angle - 0.1)
    yrotate object 2, angle
	`If InKey$()="w" Then move object 2,0.001
	move object 2,0.002
	
	rotate object 3,0,rotation#,0
	
	camx = (-sin(angle)*distance)+object position x(2)
    camz = (-cos(angle)*distance)+object position z(2)
    position camera camx, camy, camz
    
    point camera object position x(2), object position y(2), object position z(2)
    
    if object collision(1,2) Then move object 2,-0.4
	
Loop

+ Code Snippet

Rem Project: Racer
Rem Created: Friday, December 17, 2010

Rem ***** Main Source File *****

`loading objects
load object "media\rm_map.x",1
load object "media\racer.x",2
load object "media\coin.x",3
load image "media\coin.bmp",3

`positioning player & scaling & rotating
scale object 2,30,30,30
position object 2,-3,0.3,0
scale object 3,25,25,25

position object 3,0,0.3,1

`texturing
texture object 3,3

`vars

camx as float = 0.0
camy as float = 2.0
camz as float = -10.0

// distance between object and camera
distance as float = 2.0

// the angle of the object
angle as float = 0.0

rotation# = 0

set object collision to polygons 1
set object collision to polygons 2

Do
	rotation# = rotation# + 0.2
	`object position X/Y/Z
    if InKey$()="d" then angle = wrapvalue(angle + 0.1)
    if Inkey$()="a" then angle = wrapvalue(angle - 0.1)
    yrotate object 2, angle
	`If InKey$()="w" Then move object 2,0.001
	move object 2,0.002
	
	rotate object 3,0,rotation#,0
	
	camx = (-sin(angle)*distance)+object position x(2)
    camz = (-cos(angle)*distance)+object position z(2)
    position camera camx, camy, camz
    
    point camera object position x(2), object position y(2), object position z(2)
    
    if object collision(1,2) Then move object 2,-0.4
	
Loop

Cheers!

~Kamac

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