Basic pixelating shader

Import from libraries.

Copy
import lib-sampler.glsl
Copied to your clipboard
import lib-sampler.glsl

We define the global light position

Copy
const vec3 light_pos = vec3(10.0, 10.0, 10.0);
Copied to your clipboard
const vec3 light_pos = vec3(10.0, 10.0, 10.0);

We bind the auto param world eye position to our uniform camera_pos.

Copy
//: param auto world_eye_position
 uniform vec3 camera_pos;
Copied to your clipboard
//: param auto world_eye_position
 uniform vec3 camera_pos;

We bind the document's channel base color to our uniform basecolor_tex.

Copy
//: param auto channel_basecolor
 uniform SamplerSparse basecolor_tex;
Copied to your clipboard
//: param auto channel_basecolor
 uniform SamplerSparse basecolor_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.

Copy
//: param custom {
 //:  "default": 0.4,
 //:   "min": 0.0,
 //:   "max": 1.0,
 //:   "label": "Unlit outline thickness"
 //: }
 uniform float unlit_outline_thickness;
Copied to your clipboard
//: 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.

Copy
//: param custom {
 //:   "default": 0.1,
 //:   "min": 0.0,
 //:   "max": 1.0,
 //:   "label": "Lit outline thickness"
 //: }
 uniform float lit_outline_thickness;
Copied to your clipboard
//: param custom {
 //:   "default": 0.1,
 //:   "min": 0.0,
 //:   "max": 1.0,
 //:   "label": "Lit outline thickness"
 //: }
 uniform float lit_outline_thickness;

Entry point of the shader.

Copy
void shade(V2F inputs)
 {
Copied to your clipboard
void shade(V2F inputs)
 {

We compute a few useful values.

Copy
  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));
Copied to your clipboard
  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. If outline condition is reach, exit with black color.

Copy
  if (NdV < mix(unlit_outline_thickness, lit_outline_thickness, NdL)) {
     return;
   }
 
   vec3 baseColor = getBaseColor(basecolor_tex, inputs.sparse_coord);
Copied to your clipboard
  if (NdV < mix(unlit_outline_thickness, lit_outline_thickness, NdL)) {
     return;
   }
 
   vec3 baseColor = getBaseColor(basecolor_tex, inputs.sparse_coord);

Introduce some jitter to mask size, based on base color luminance

Copy
  float maskRadiusJitter = pow(dot(baseColor, vec3(0.3333)), 0.1);
Copied to your clipboard
  float maskRadiusJitter = pow(dot(baseColor, vec3(0.3333)), 0.1);

Compute a mask value, based on screen space position of fragment. This will create a grid like pattern.

Copy
  float mask = pow(1.0 - length(fract(gl_FragCoord.xy / 7.0) - vec2(0.5)), maskRadiusJitter * 5.0) * 5.0;
Copied to your clipboard
  float mask = pow(1.0 - length(fract(gl_FragCoord.xy / 7.0) - vec2(0.5)), maskRadiusJitter * 5.0) * 5.0;

Here, we sample the base color and apply a simple diffuse attenuation

Copy
  vec3 color = baseColor * NdL;
 
   diffuseShadingOutput(mask * color);
 }
 
 
Copied to your clipboard
  vec3 color = baseColor * NdL;
 
   diffuseShadingOutput(mask * color);
 }
 
 

Last updated 10/3/2024

Was this helpful?

Yes

No