Hi Michael,
Hi.
I haven't found any example of using cubemaps from GLSL in OSG
examples and on the web. I only found cubemap usage in osgOcean:
http://goo.gl/NwTTs9
It has the following "varying" in the vertex shader:
nCube = gl_Vertex.xyz;
And the following usage of it in the fragment one:
vec3 p = vec3(nCube.x, nCube.y, -nCube.z);
gl_FragColor = textureCube(cubeMap, p.xzy);
I used it in my example and the result is the cubemap mapped to boxes
without any motion when I turn camera around (the screenshot is
attached to the mail).
What's the correct way to get moving cube map when I turn camera around?
You might try the transformed normal to perform the lookup.
e.g. vec3 normal = osg_NormalMatrix * gl_Normal;
vec4 color = textureCubeMap(cubeMap, normalize(normal));
If this is not what you are after (e.g. If you are looking for sky-box
like reflections), the you need to use the reflection vector which is
something like:
vec3 normal = osg_NormalMatrix * gl_Normal;
vec4 view = osg_ModelViewMatrix * gl_Vertex;
vec3 reflect = reflect(normalize(-view.xyz), normal);#
Sorry this is out of my head and I didn't test it. But it should give
you the idea.
Btw. This has nothing to do with OSG. Google for cubemapping glsl.
cheers
Sebastian
Thanks.
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