created stage atlas+meshes, simplifying models and materials

assets/shaders/stage.js

@@ -0,0 +1,28 @@
+module.exports = {
+  vertexShader : `
+    varying vec2 uvs;
+    varying vec3 worldPos;
+    void main() {
+      uvs.xy = uv.xy;
+      vec4 p = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+      worldPos = (modelMatrix * vec4( position, 1.0 )).xyz;
+      gl_Position = p;
+    }
+  `,
+
+  fragmentShader: `
+    #define FOG_RADIUS  50.0
+    #define FOG_FALLOFF 45.0
+    varying vec2 uvs;
+    varying vec3 worldPos;
+    uniform vec3 color;
+    uniform vec3 fogColor;
+    uniform sampler2D src;
+
+    void main() {
+      vec4 col = texture2D(src, uvs);
+      col.xyz = mix(fogColor, col.xyz, clamp(distance(worldPos, vec3(0., 0., -FOG_RADIUS)) / FOG_FALLOFF, 0., 1.));
+      gl_FragColor = col;
+    }
+  `
+};