tuxracer ice reflection

[IronRaph]

I just want to know how ice reflection works in tuxracer
(he uses a env map ) but I don't know how ...
because :
glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
is not so good as in tuxracer
thanks

[knackered]

This is going to be some kind of arctic stategy game, I take it?

[IronRaph]

go to www.Mountain-tycoon.fr.st

[ScottManDeath]

Hi

The terrain looks nice.
On one of your screenshoots ( http://raphael.siryani.free.fr/mount...s/shoot030.jpg ) I see that there is some kind of atmoshperic effect in the backgrounds mountains. How do you do this? Is that fog or something special?

Bye
ScottManDeath

[Mezz]

It looks more like snow to me ScottManDeath

(You can see it blend to it on the left hand side of the image)

But I could be wrong...

[jwatte]

I don't know how Tux Racer does it.

However, I do know that Sphere Maps don't look very good, and can't be updated dynamically because of the warping needed.

I suggest using cubic environment maps, which are a standard part of OpenGL 1.3, and an ARB extension that everyone supports before that.

If all you want is a reflection in a plane (like ice) then you can also look into various mirroring portal techniques, like virtually reflecting the camera position in the ice, and putting a clipping plane along the mirror plane, and re-rendering the scene in additive mode. (Stencil helps here, too) You can also render-to-texture using the same mirrored camera set-up, and put that texture on the ice.

Hope these ideas give you something to go on. Google should be full of hits if you plug in some of these words.

[IronRaph]

thanks but such techniques is too expensive I just want to do a fake effect (like in tuxracer)
and the atmospheric is just some quad with a texture with a variant alpha channel (like in fs2002 )

[knackered]

Just use eye linear automatic texture coordinate generation.

[IronRaph]

ok I will try thanks

[IronRaph]

glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR);
float eye_plane[4]={0.1f,0.1f,0.1f,0.1f};
glTexGenfv(GL_S,GL_EYE_PLANE,eye_plane);
glTexGenfv(GL_T,GL_EYE_PLANE,eye_plane);

I don't know how I can use the eye_plane params ... wich value and why thanks

[This message has been edited by IronRaph (edited 07-11-2002).]