koobas.hobune.stream
Animating a cubemaps orientation
Hey All,
I want to add an animated "sheen" reflection to my puzzle game and I am thinking the best way to achieve this is through a cubemap. What I'd need is the ability to animate the cubemap's orientation over time. Is this possible? I am using Unity Basic/iOS Basic.
Any information is greatly appreciated!
Thanks,
A search for 'cubemap rotate' returns quite a few results. I have nearly zero experience in manipulating shaders, so I'm not going to even try to pretend this is a real answer, but it seems that either rotating the shader algorithm (my brain asplode) or rotating the cubemap source object (much easier) should rotate the sheen.
You'd want to rotate the view direction vector reflected by the surface normal (all normalized) with a quaternion passed in (as a shader parameter vector) representing the rotation you want.
Here's some quaternion rotation shader code:
vec3 rotate_vector( vec4 quat, vec3 vec )
{
return vec + 2.0 * cross( cross( vec, quat.xyz ) + quat.w * vec, quat.xyz );
}
