[SOLVED] how can I get camera direction in shader?

[steve3d]

I want to write a custom shader for ObjectDynamic, which will need a camera direction. but the shader system has no variable defined as s_camera_dir or s_camera_direction.

 

so how can I get the camera's direction in shader?

 

I'm assuming using column 3 of s_imodelview matrix should be the camera direction. But I'm not sure this is right.

[frustum]

Unigine render is camera relative. So in terms of shaders camera direction is 0,0,1 or (0,0,-1). s_imodelview matrix is required only if you need to get world-space camera direction.

[steve3d]

Yes, I need the world space camera direction, so column 3 of s_imodelview is the camera direction in world space?

[frustum]

Yep.