Accessing a vertex color in a Surface Shader
Let's begin this chapter by taking a look at how we can access the information of a model's vertex using the vertex function in a Surface Shader. This will arm us with the knowledge to start utilizing the elements contained within a model's vertex to create really useful and visually appealing effects.
A vertex in a vertex function can return information about itself that we need to be aware of. You can actually retrieve the vertices' normal directions as a float3 value, the position of the vertex as float3, and you can even store color values in each vertex and return that color as float4. This is what we will take a look at in this recipe. We need to see how to store color information and retrieve this stored color information inside each vertex of a Surface Shader.
Getting ready
In order to write this shader, we need to prepare a few assets. The following steps will set us up to create this Vertex Shader:
In order to view the colors of a vertex...
