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Toon - Shader API
Basic toon shader
Import from libraries.
import lib-sampler.glsl
We define the global light position
const vec3 light_pos = vec3(10.0, 10.0, 10.0);
We bind the auto param world eye position to our uniform camera_pos.
//: param auto world_eye_position uniform vec3 camera_pos;
We bind the document's channel base color to our uniform basecolor_tex.
//: param auto channel_basecolor uniform SamplerSparse basecolor_tex;
We bind the mesh curvature to our uniform curvature_tex. If no curvature is available, transparent texture is provided.
//: param auto texture_curvature uniform SamplerSparse curvature_tex;
We define a new custom tweak for this shader, along with its default value. This one is used to tweak the thickness of outline, when shadowed.
//: param custom { //: "default": 0.4, //: "min": 0.0, //: "max": 1.0, //: "label": "Unlit outline thickness" //: } uniform float unlit_outline_thickness;
We define a new custom tweak for this shader, along with its default value. This one is used to tweak the thickness of outline, when lit.
//: param custom { //: "default": 0.1, //: "min": 0.0, //: "max": 1.0, //: "label": "Lit outline thickness" //: } uniform float lit_outline_thickness;
Whether we prefer using the curvature or not.
//: param custom { //: "default": false, //: "label": "Use curvature" //: } uniform bool use_curvature;
Entry point of the shader.
void shade(V2F inputs) {
We compute a few useful values.
vec3 V = normalize(camera_pos - inputs.position); vec3 N = normalize(inputs.normal); vec3 L = normalize(light_pos - inputs.position); float NdV = dot(N, V); float NdL = max(0.0, dot(N, L));
Priority is to performs the outline detection. Allow the user to choose whether he prefers using the curvature map for outline detection or not.
if (use_curvature) { float curv = textureSparse(curvature_tex, inputs.sparse_coord).r; NdV = 1.0 - curv; }
If outline condition is reach, exit with black color.
if (NdV < mix(unlit_outline_thickness, lit_outline_thickness, NdL)) { return; }
Here, we perform a 4 steps discretization of color.
vec3 color = getBaseColor(basecolor_tex, inputs.sparse_coord); if (NdL > 0.75) { color = color; } else if (NdL > 0.5) { color = color * 0.5; } else if (NdL > 0.1) { color = color * 0.1; } else
Fallback is black.
color = vec3(0.0); diffuseShadingOutput(color); }