Fix patch color material (#12)

* Fix patch material that doesn't use color

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@three.ez/instanced-mesh",
-  "version": "0.2.3",
+  "version": "0.2.4",
   "description": "Simplified and enhanced InstancedMesh with frustum culling, fast raycasting (using BVH), sorting, visibility management and more.",
   "author": "Andrea Gargaro <[email protected]>",
   "license": "MIT",

src/objects/InstancedMesh2.ts

@@ -171,9 +171,12 @@ export class InstancedMesh2<
       shader.defines["USE_INSTANCING_INDIRECT"] = "";
 
       if (this.colorsTexture !== null) {
+        if (!shader.fragmentShader.includes("#include <color_pars_fragment>")) return;
+
         shader.uniforms.colorsTexture = { value: this.colorsTexture };
         shader.defines["USE_INSTANCING_COLOR_INDIRECT"] = "";
         shader.fragmentShader = shader.fragmentShader.replace("#include <common>", "#define USE_COLOR\n#include <common>");
+        // NOTE that '#defined USE_COLOR' is defined only in fragment shader to make it work.
       }
     }