实现简单阴暗面着色

src/GLSL/GoochShader.ts

@@ -1,12 +1,10 @@
 import { Vector3 } from "three";
 
-//
+//https://github.com/arefin86/arefin86.github.io/blob/master/js/shaders/GoochShader.js
-/* Written by Arefin Mohiuddin - graphics n00b */
-/* with help from Gooch Shader by Randi Rost (c) 3DLabs Inc. Ltd */
 export const GoochShader = {
 	uniforms: {
 		"LightPosition": { type: "v3", value: new Vector3(-200, 0, 200) },
-		"SurfaceColor": { type: "v3", value: new Vector3(0.0, 0.0, 0.8) },
+		"SurfaceColor": { type: "v3", value: new Vector3(1.0, 1.0, 0.) },
 		"WarmColor": { type: "v3", value: new Vector3(1.0, 0.5, 0.0) },
 		"CoolColor": { type: "v3", value: new Vector3(0, 0, 0.7) },
 		"DiffuseWarm": { type: "f", value: 0.45 },
@@ -16,3 +14,11 @@ export const GoochShader = {
 	vertexShader: require("./Goodch2.vs"),
 	fragmentShader: require("./Goodch2.fs")
 }
+
+export const GoochShaderSimple = {
+	uniforms: {
+		"SurfaceColor": { type: "v3", value: new Vector3(1.0, 1.0, 1.0) }
+	},
+	vertexShader: require("./GoodchSimple.vs"),
+	fragmentShader: require("./GoodchSimple.fs")
+}

src/GLSL/GoodchSimple.fs

@@ -0,0 +1,8 @@
+
+uniform vec3  SurfaceColor;
+varying float NdotL;
+
+void main(void) 
+{
+    gl_FragColor  = vec4 (SurfaceColor * NdotL, 1.0);
+}

src/GLSL/GoodchSimple.vs

@@ -0,0 +1,9 @@
+varying float NdotL;
+
+void main()
+{
+    vec3 trans_norm = normalize(normalMatrix * normal);
+    vec3 lightVec   = normalize(vec3(-1.0, 1.0, 1.0));
+    NdotL           = (dot (lightVec, trans_norm) + 1.0)  *0.5;
+    gl_Position     = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+}