If you have studied shader theory and computational graphics in the past, then the only impediment would be the Unity 3D interface.
You can create with right-click on Unity 3D interface.
This will create a shader file, you can open and see the default shader.
Let's make a CG shader with one color.
Remove all content from this file and add this source code:
Shader "Cg basic shader" { // this is the name of the shader
SubShader { // Unity chooses this like an subshader and works with your GPU specifications
Pass { // passes in higher-level shader/material systems GLSL/Cg/HLSL is a way of setting up states necessary for multi-pass rendering, in this case is one pass
CGPROGRAM // start programming with Unity's Cg
#pragma vertex vert
// this specifies the vert function as the vertex shader
#pragma fragment frag
// this specifies the frag function as the fragment shader
// define vert for vertex shader
float4 vert(float4 vertexPos : POSITION) : SV_POSITION
// vertex shader
{
return UnityObjectToClipPos(vertexPos);
// this line transforms the vertex input parameter
// and returns it as a nameless vertex output parameter
// (with semantic SV_POSITION)
}
// define frag for fragment shader
float4 frag(void) : COLOR // fragment shader
{
return float4(0.0, 1.9, 7.6, 1.0);
// this fragment shader returns a nameless fragment
// output parameter (with semantic COLOR) that is set to
// opaque red (red = 1, green = 0, blue = 0, alpha = 1)
}
ENDCG // ends the part in programming with Unity's Cg
}
}
}
This is a standard shader and if you search on the web you can find more simple shaders.
Add an object to your scene, create a new material, and add to this object, drag the file shader to the material, and will fill with this RGBA color: 0.0, 1.9, 7.6, 1.0.
