blanders refraction doen't work

[ritti]

Hi,
to be more specific, I'm trying to make a glass model with refraction.
If I look through this model, all that whats behind it should be distorted (as I look through a glass of water), but thats not the case.
What I did:
a sphere in blender with transparent material, and changed the IOR value to 1.1 in the Raytrace tab.
exported as b3d and obj, then I loaded it in my game.
But if I put a Scenenode behind this sphere it looks normal instead of distorted.

Am I missing something?
Or can I set this IOR value directly in Irrlicht?

Any help would be much appreciated.
Best regards
Ritti

[CuteAlien]

I don't think you can do that with standard materials. Pretty certain you will need a shader for that.

[ritti]

Thank you for your answer,
I found this nice tutorial http://irrlicht.sourceforge.net/forum/v ... hp?t=27054
but there I have to do 2 draw calls and well thats no option in a strategy game

Maybe do you know a good alternative?

Thanks and best regards

Ritti

[sudi]

Thank you for your answer,
I found this nice tutorial http://irrlicht.sourceforge.net/forum/v ... hp?t=27054
but there I have to do 2 draw calls and well thats no option in a strategy game

Maybe do you know a good alternative?

Thanks and best regards

Ritti

Why are 2 draw calls not an option?

Besides transparent objects are drawn after the solid ones. So you can render the solid scene to a rendertarget. copy that target. then render the transparent objects into the first one and use the scene copy to make the disortion. but i think thats how the example there works anyways

[ritti]

Yes you are right, thats how the example works.
The problem is that the game slows down terribly with two draw calls.
Maybe it would be no problem with hardware skinning, but as long as this doesn't work with opengl in Linux I can't use it.

[christianclavet]

Hi,

a sphere in blender with transparent material, and changed the IOR value to 1.1 in the Raytrace tab.

CuteAlien was right. RAYTRACING is not supported on any realtime rendering engine that I know of.

This effect must be faked with a shader. Your example is good for that and I think you need 2 passes because it's using RTT to do it's stuff.

The problem is that the game slows down terribly with two draw calls.

These effects are "expansive" to render. Why faking raytracing effects in a strategy game? Is it really needed?

Maybe it would be no problem with hardware skinning

This is only related to the skinning of the bones and it's surrounding meshes. Nothing related to the rendering of a model material.