Implementation

• Rainbow animation effect, using a grayscale texture to distort the UVs for sampling the rainbow colors.
• Utilizing the _Time built in variable to make the UVs offset with time.
• Using Culling to only render inner sides of the box.
• Transparency implemented using RenderType and Queue for transparency, ZWrite off for best practices, and Blend One One.
• Obtaining the view direction by substracting the world space position of the vertex to the _WorldSpaceCameraPos.
• Basic Fresnel effect achieved by doing the dot product between the view direction and the normal.
• Using built in functions and variables from Core.hlsl and Lighting.hlsl
• Obtaining the main light direction using the built in GetMainLight()
• Computing a basic Blinn Phong lighting model by reflecting the main light dir along the normal, then doing the dot product with the view dir.
• Using a Particle System to render the question mark inside the box.
• Using an Animation Controller to implement the animations.
• Drawing the textures in Affinity Photo for the box.