Correct the Phong shading by passing a normalized pixel normal for lighting computation. Next job is to modulate the texture color.
Added a naive animation.
Texture modulation added to Gouraud shader.
Added texture to Phong shader.
Merge branch 'animation' into project2 by solving
conflicts in asgn2/PA3/shaders/blinn_phong_frag.glsl.
Next job is to give out an interesting animation.
An proper sine translation added to the animation function.