thanks for the feedback. I''ve make a quiet detail tank model but the game runs slow on my pc because I like to put a bunch of tanks together. So I put the old model back(temporarily). If you want the aircraft model you can get it at MODELS page of my website. It''s free for everybody.

I''m searching for a billboarding tutorial that use the projection/modelview matrix to calculate the angle. Right now I''m using the camera angle to rotate the quads and in the last camera it doesn''t work right.

Actually you can modify the fog/light in the config/stageXX.txt file. The terrain lighting is precalculated using the diffuse light that you give. Actually I tried to increase the contras but I keep increasing the brightness too.

billboarding is pretty straight forward.
assuming your only using the projection matrix for fov/aspect, then it's juts down to the modelview matrix...


this is code ripped straight from my project:


spriteAngle[0]=Vector3(modelview[0],modelview[1],modelview[2]);
spriteAngle[1]=Vector3(modelview[4],modelview[5],modelview[6]);

(this code is set when you set your camera position, NOT every time you use glTranslate, or whatnot, to move to render an object)

if you add and subtract each from a vertex, to get 4 vertices, you then will get a diamond shape on screen... to make that a square instead, you can just do a matrix mult of the vectors with a matrix rotated on 0,0,-PI/4... you may also want to scale to correct the aspect ratio... (thats done to these two vectors, not on the billboard vertices)..

so a billboard would just end up having the following vectices:

Vector3 position; //billboard position

Vector3 vertices[4]={
position+spriteAngle[0],
position+spriteAngle[1],
position-spriteAngle[0],
position-spriteAngle[1]};

and bang, you have vertices for a billboard.

[edited by - RipTorn on November 19, 2002 8:43:48 PM]

ok, thanks alot 8)