Specular is incorrect for isometric camera + direct light

[1vanK]

[1vanK]

@eugeneko

I think eye direction (cCameraPosPS - vWorldPos.xyz) must be the same for any point on the screen with the orthographic camera.

float spec = GetSpecular(normal, cCameraPosPS - vWorldPos.xyz, lightDir, cMatSpecColor.a);

[eugeneko]

I've got me thinking... Yep, I think you are right.
Eye vector should be a vector from screen to object, which is the same as "cCameraPosPS - vWorldPos.xyz" for perspective matrix, but should be just "camera direction" for ortho.