Summary.
What you’re practicing in this post may be helpful when implementing a skin shader in the next.
The goal is to understand the depth of each content by first implementing it individually rather than connecting all the function implementations. .
Again, use pbr-metal-roughness.glsl, open the shader code and add the bool variable as shown below.
//-------- BLur --------------------------------------------//
//: param custom { "default": false, "label": "Blur" }
uniform bool b_blur;Code language: JavaScript (javascript)The b_blur variable will work in pairs with //: param custom {“default”: false, “label”: “blur”}.
For the Blur function to be used in this exercise, refer to the link below.
vec4 blur9(sampler2D image, vec2 uv, vec2 resolution, vec2 direction) {
vec4 color = vec4(0.0);
vec2 off1 = vec2(1.3846153846) * direction;
vec2 off2 = vec2(3.2307692308) * direction;
color += texture2D(image, uv) * 0.2270270270;
color += texture2D(image, uv + (off1 / resolution)) * 0.3162162162;
color += texture2D(image, uv - (off1 / resolution)) * 0.3162162162;
color += texture2D(image, uv + (off2 / resolution)) * 0.0702702703;
color += texture2D(image, uv - (off2 / resolution)) * 0.0702702703;
return color;
}
Let’s modify the above reference code to fit the Substance Painter API. Let’s take a look at the documentation to reference the internal API.
1. Sparse API
file:///C:/Program%20Files/Allegorithmic/Substance%20Painter/resources/shader-doc/lib-sparse.html
2. Sampler API
file:///C:/Program%20Files/Allegorithmic/Substance%20Painter/resources/shader-doc/lib-sampler.html
//blur9 function here
vec4 blur9( SamplerSparse image , SparseCoord uv, vec2 resolution, vec2 direction)
{
vec4 color = vec4(0.0);
vec2 off1 = vec2(1.3846153846) * direction;
vec2 off2 = vec2(3.2307692308) * direction;
color += getBaseColor(image, uv) * 0.2270270270;
uv +=(off1 / resolution);
color += getBaseColor(image, uv) * 0.3162162162;
uv -=(off1 / resolution);
color += getBaseColor(image, uv) * 0.3162162162;
uv +=(off2 / resolution);
color += getBaseColor(image, uv) * 0.0702702703;
uv-=(off2 / resolution);
color += getBaseColor(image, uv) * 0.0702702703;
return color;
}
Now that we have the proper function, let’s apply it to Albedo.