3d model only shows up at certain distances

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puppyofkosh

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Joined: 9th Jan 2007

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Posted: 6th May 2008 20:40

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Hi, I'm new to DB and I'm making a game in which the player is a helicopter that flies around a little world...So, my idea was to make walls for the world and then add scenery etc. But, when the player moves, one of the walls kind of disappears. See screeny.

load object "media\models\static\h\HELICO11.x",1
position object 1,25,10,35
yrotate object 1,180
fix object pivot 1

load bitmap "media\bitmaps\textures\real\water\water2.BMP",1
get image 1,0,0,256,256
delete bitmap 1

REM Load the new bitmap textures here.
load bitmap "media\bitmaps\textures\real\stone\dark02.BMP",2
get image 2,0,0,64,64
Rem don't load textures beyond here

x = object position x(1) - 20
y = object position y(1) - 20
z = object position z(1) - 20

Rem create world
make object box 2,1000,1000,0
position object 2,500,500,0
texture object 2,2

make object box 3,1000,1000,0
rotate object 3, 0,90,0
position object 3,0,500,500
texture object 3,2

make object box 4,1000,1000,0
position object 4,500,500,1000
texture object 4,2

make object box 5,1000,1000,0
rotate object 5, 0,90,0
position object 5,1000,500,500
texture object 5,2

make matrix 1,1000,1000,11,11
prepare matrix texture 1,1,2,2
randomize matrix 1,4
set matrix texture 1,0,1

sync on
draw to front

rotate camera 0,180,0
set camera range 1,1000
Set camera to follow x,y,z,0,50,10,10,0

do
x = object position x(1) - 20
y = object position y(1) - 20
z = object position z(1) - 20

Set camera to follow x,y,z,0,15,10,10,0

if downkey() = 1 then move object 1,-1

if upkey()=1 then move object 1,1

if leftkey()=1 then turn object left 1,2

if rightkey()=1 then turn object right 1,2

sync

loop

+ Code Snippet

load object "media\models\static\h\HELICO11.x",1
position object 1,25,10,35
yrotate object 1,180
fix object pivot 1

load bitmap "media\bitmaps\textures\real\water\water2.BMP",1
get image 1,0,0,256,256
delete bitmap 1

REM Load the new bitmap textures here.
load bitmap "media\bitmaps\textures\real\stone\dark02.BMP",2
get image 2,0,0,64,64
Rem don't load textures beyond here


x = object position x(1) - 20
y = object position y(1) - 20
z = object position z(1) - 20

Rem create world
make object box 2,1000,1000,0
position object 2,500,500,0
texture object 2,2

make object box 3,1000,1000,0
rotate object 3, 0,90,0
position object 3,0,500,500
texture object 3,2

make object box 4,1000,1000,0
position object 4,500,500,1000
texture object 4,2

make object box 5,1000,1000,0
rotate object 5, 0,90,0
position object 5,1000,500,500
texture object 5,2






make matrix 1,1000,1000,11,11
prepare matrix texture 1,1,2,2
randomize matrix 1,4
set matrix texture 1,0,1

sync on
draw to front

rotate camera 0,180,0
set camera range 1,1000
Set camera to follow x,y,z,0,50,10,10,0

do
x = object position x(1) - 20
y = object position y(1) - 20
z = object position z(1) - 20

Set camera to follow x,y,z,0,15,10,10,0

	if downkey() = 1 then move object 1,-1

	if upkey()=1 then move object 1,1

	if leftkey()=1 then turn object left 1,2

	if rightkey()=1 then turn object right 1,2

sync

loop

Any help is appreciated.

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Robert The Robot

19

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Joined: 8th Jan 2007

Location: Fireball XL5

Posted: 6th May 2008 21:35

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The key point here is your command "set camera range 1, 1000". This tells DB to NOT draw anything on screen that is more than 1000 units away from the camera. Now, your four walls form a kind of cube that is exactly 1000x1000 units. Move backwards by just one unit, and the wall directly in front of you is 1001 units away - and so isn't drawn on screen.

Now, the solution, which is pretty straightforward - just say "Set Camera Range 1, 2000". That way, you can move backwards 1000 units to where your rear wall is, and your front wall will still be in view. You could just delete the command entirely, and leave DB to use its default range of 1, 5000!

I would just like to say, though, that there is a better (well, I think it's better) way of creating your walls, though a little more complex. Instead of making a box out of 4 walls, make a single "Skybox" from one object: Make Object Cube 2, 1000

This will give you an object that is textured when you look at it from the outside. But the helicopter is inside the cube, so to make your walls texture visible, we have to turn the cube inside out: Scale Object 2, -100, -100, -100

This is a bit easier on polygons (each wall you had was a cuboid made up of 12 polygons, giving a total of 48 polys, but this method only uses 12!). However, the bottom of the cube is now in collision with your land matrix. A better piece of code would be:

+ Code Snippet

Make object box, 2, 1000, 1010, 1000
Scale Object 2, -100, -100, -100
Position Object 2 0, -10, 0

where the cuboid is a little taller than actually needed, and so can be dropped below your matrix to prevent any interference.

Hope this is of some use! (And by the way, I really like your textures!)
RTR

It is said there are 10 types of people in this world - those who understand binary, and those who have friends!

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puppyofkosh

19

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Joined: 9th Jan 2007

Location:

Posted: 6th May 2008 22:44

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Thanks so much!

Quote: "Now, the solution, which is pretty straightforward - just say "Set Camera Range 1, 2000""

Thank you! I used 1415 or 1414.213562373095 to be precise(good 'ol pathagoreum theorum).

As for your idea for the single box, thank you! I am trying it now.

Quote: "And by the way, I really like your textures!"

LOL!

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puppyofkosh

19

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Joined: 9th Jan 2007

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Posted: 6th May 2008 23:16

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Hi, I used your code and now I can't see the box sometimes. Here's the code.

load object "media\models\static\h\HELICO11.x",1
position object 1,25,10,35
yrotate object 1,180
fix object pivot 1

load bitmap "media\bitmaps\textures\real\water\water2.BMP",1
get image 1,0,0,256,256
delete bitmap 1

REM Load the new bitmap textures here.
load bitmap "media\bitmaps\textures\real\stone\dark02.BMP",2
get image 2,0,0,64,64
Rem don't load textures beyond here

x = object position x(1) - 20
y = object position y(1) - 20
z = object position z(1) - 20

Rem create world
Make object box 2, 1000, 1010, 1000
Scale Object 2, -100, -100, -100
Position Object 2, 0, -10, 0
texture object 2,2

make matrix 1,1000,1000,11,11
prepare matrix texture 1,1,2,2
randomize matrix 1,4
set matrix texture 1,0,1

sync on
draw to front

rotate camera 0,180,0
set camera range 1,1415
Set camera to follow x,y,z,0,50,10,10,0

do
x = object position x(1) - 20
y = object position y(1) - 20
z = object position z(1) - 20

Set camera to follow x,y,z,0,15,10,10,0

if downkey() = 1 then move object 1,-1

if upkey()=1 then move object 1,1

if leftkey()=1 then turn object left 1,2

if rightkey()=1 then turn object right 1,2

sync

loop

+ Code Snippet

load object "media\models\static\h\HELICO11.x",1
position object 1,25,10,35
yrotate object 1,180
fix object pivot 1

load bitmap "media\bitmaps\textures\real\water\water2.BMP",1
get image 1,0,0,256,256
delete bitmap 1

REM Load the new bitmap textures here.
load bitmap "media\bitmaps\textures\real\stone\dark02.BMP",2
get image 2,0,0,64,64
Rem don't load textures beyond here


x = object position x(1) - 20
y = object position y(1) - 20
z = object position z(1) - 20

Rem create world
Make object box 2, 1000, 1010, 1000
Scale Object 2, -100, -100, -100
Position Object 2, 0, -10, 0
texture object 2,2

make matrix 1,1000,1000,11,11
prepare matrix texture 1,1,2,2
randomize matrix 1,4
set matrix texture 1,0,1

sync on
draw to front

rotate camera 0,180,0
set camera range 1,1415
Set camera to follow x,y,z,0,50,10,10,0

do
x = object position x(1) - 20
y = object position y(1) - 20
z = object position z(1) - 20

Set camera to follow x,y,z,0,15,10,10,0

	if downkey() = 1 then move object 1,-1

	if upkey()=1 then move object 1,1

	if leftkey()=1 then turn object left 1,2

	if rightkey()=1 then turn object right 1,2

sync

loop

Screeny attached.

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Robert The Robot

19

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Joined: 8th Jan 2007

Location: Fireball XL5

Posted: 7th May 2008 18:31

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Quote: "Hi, I used your code and now I can't see the box sometimes."

Sorry, my fault (I didn't have DB with me when I posted, so I couldn't test at the time). You don't actually need the "Scale Object" command, and calling it was messing everything up

. You can actually turn the skybox inside out at the moment you create it by specifying negative dimensions:

+ Code Snippet

Make object box 2, -1000, -1010, -1000
Position Object 2, 0, 490, 0
Set Object 2,1,1,0

I've also added the Set Object command - the only relevant bit is the final 0, which makes DB draw every polygon on screen. This just means you can see the box when you're outside it. You'll also notice I've modified the Position Object command. By positioning the skybox at -10, I was actually putting 490 units above the matric and 510 units below (object positions go from the object's centre, which would actually have to be well above zero).

One other thing I noticed (I only got a chance to run your code earlier today) was that the matrix didn't line up with the skybox. Again, this is coordiantes - X=0, Z=0 will centre an object about 0, 0 but X=0 and z=0 positions one corner of a matrix to 0, 0 (can't think which one off the top of my head). Anyway, try running this:

load object "media\models\static\h\HELICO11.x",1
position object 1,25,10,35
yrotate object 1,180
fix object pivot 1

load bitmap "media\bitmaps\textures\real\water\water2.BMP",1
get image 1,0,0,256,256
delete bitmap 1

REM Load the new bitmap textures here.
load bitmap "media\bitmaps\textures\real\stone\dark02.BMP",2
get image 2,0,0,64,64
Rem don't load textures beyond here

x = object position x(1) - 20
y = object position y(1) - 20
z = object position z(1) - 20

Rem create world
Make object box 2, -1000, -1010, -1000
Position Object 2, 0, 490, 0
Set Object 2,1,1,0
texture object 2,2

make matrix 1,1000,1000,11,11
Position Matrix 1, -500, 0, -500
prepare matrix texture 1,1,2,2
randomize matrix 1,4
set matrix texture 1,0,1

sync on
draw to front

rotate camera 0,180,0
set camera range 1,1415
Set camera to follow x,y,z,0,50,10,10,1.0

do
	x = object position x(1) - 20
	y = object position y(1) - 20
	z = object position z(1) - 20

Set camera to follow x,y,z,0,15,10,10,1.0

if downkey() = 1 then move object 1,-1

if upkey()=1 then move object 1,1

if leftkey()=1 then turn object left 1,2

if rightkey()=1 then turn object right 1,2

sync

loop

+ Code Snippet

load object "media\models\static\h\HELICO11.x",1
position object 1,25,10,35
yrotate object 1,180
fix object pivot 1

load bitmap "media\bitmaps\textures\real\water\water2.BMP",1
get image 1,0,0,256,256
delete bitmap 1

REM Load the new bitmap textures here.
load bitmap "media\bitmaps\textures\real\stone\dark02.BMP",2
get image 2,0,0,64,64
Rem don't load textures beyond here


x = object position x(1) - 20
y = object position y(1) - 20
z = object position z(1) - 20

Rem create world
Make object box 2, -1000, -1010, -1000
Position Object 2, 0, 490, 0
Set Object 2,1,1,0
texture object 2,2

make matrix 1,1000,1000,11,11
Position Matrix 1, -500, 0, -500
prepare matrix texture 1,1,2,2
randomize matrix 1,4
set matrix texture 1,0,1

sync on
draw to front

rotate camera 0,180,0
set camera range 1,1415
Set camera to follow x,y,z,0,50,10,10,1.0

do
	x = object position x(1) - 20
	y = object position y(1) - 20
	z = object position z(1) - 20

Set camera to follow x,y,z,0,15,10,10,1.0

	if downkey() = 1 then move object 1,-1

	if upkey()=1 then move object 1,1

	if leftkey()=1 then turn object left 1,2

	if rightkey()=1 then turn object right 1,2

	sync

loop

Hope it works!

Quote: ""And by the way, I really like your textures!"
LOL!"

Yes, I realise now that they're actually supplied with DB - or at least, the walls stone effect is. I can't find your seascape (and that's the one I really liked!)

It is said there are 10 types of people in this world - those who understand binary, and those who have friends!

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puppyofkosh

19

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Joined: 9th Jan 2007

Location:

Posted: 7th May 2008 22:34

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Thank you very much! I ran the code and it works perfectly. As for the texture it was in Darkmatter 1, textures\bmp\natural\water2...lol...
Anyways thanks so much!

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