noise shader

utils/material.ts

@@ -1,6 +1,6 @@
 import { Color, DataTexture, DoubleSide, MeshBasicMaterial, MeshStandardMaterial, RepeatWrapping, RGBFormat, Texture, TextureLoader, Vector2 } from "three"
-import { useLoader, type TresLoader } from '@tresjs/core'
+import { useLoader, } from '@tresjs/core'
-import { getFilename, patterns, type patternTypes } from "~/components/pattern"
+import { getFilename, patterns, } from "~/components/pattern"
 
 
 const set_metaril_func = (scene: any, material: any) => {
@@ -9,15 +9,11 @@ const set_metaril_func = (scene: any, material: any) => {
             el.castShadow = true
             el.receiveShadow = true
         }
-
-        // if (el.material) {
         el.material = material
-        // }
         set_metaril_func(el, material)
     })
 }
 
-const noiseTexturePromise = useLoader(TextureLoader, '/texture/images.jpeg')
 const loaded_patterns: { [key: string]: any } = {}
 for (let index = 0; index < patterns.length; index++) {
     const element = patterns[index];
@@ -78,6 +74,48 @@ export const set_material = (scene: any, color: any, pattern: { pattern: pattern
             })
         }
     }
+    material.onBeforeCompile = (shader) => {
+        // Добавляем uniform переменную
+        shader.uniforms.customUniform = { value: 1.0 };
+
+        // Изменяем вершинный шейдер
+        shader.vertexShader = `
+            uniform float customUniform;
+            varying vec2 vPosition; 
+            ${shader.vertexShader}
+        `.replace(
+            `#include <begin_vertex>`,
+            `#include <begin_vertex>
+            vPosition = position.xy;
+            `
+        );
+
+        // Изменяем фрагментный шейдер
+        shader.fragmentShader = `
+            varying vec2 vPosition;
+            float random(float p) {
+                return fract(sin(p) * 10000.0);
+            }
+
+            float noise(vec2 p) {
+                return random(p.x + p.y * 10000.0);
+            }
+
+            float stepNoise(vec2 p) {
+                return noise(floor(p));
+            }
+            ${shader.fragmentShader}
+        `.replace(
+            `#include <dithering_fragment>`,
+            `#include <dithering_fragment>
+
+            vec2 p = vPosition * 10000.0;
+            float brightness = stepNoise(p);
+            float lightingEffect = dot(vNormal, vec3(0.0, 0.0, 1.0));
+            gl_FragColor.rgb *= vec3(brightness) * lightingEffect;
+            `
+        );
+    };
 
     if (scene) set_metaril_func(scene, material)
     else console.log(scene)