GLTFMarker.setUniform方法，增加对nodexIndex参数的支持

packages/layer-gltf/src/GLTFMarker.js

@@ -317,7 +317,13 @@ export default class GLTFMarker extends Marker {
         //此处涉及到材质的更新，比较耗费性能，对于不需要更新材质的操作尽量不去更新
         if (markerUniforms  && this.isDirty() && this._isUniformsDirty()) {
             for (const u in markerUniforms) {
-                mesh.setUniform(u, markerUniforms[u]);
+                if (this._uniformNodeIndex && defined(this._uniformNodeIndex[u])) {
+                    if (Number(mesh.properties.nodeIndex) === this._uniformNodeIndex[u]) {
+                        mesh.setUniform(u, markerUniforms[u]);
+                    }
+                } else {
+                    mesh.setUniform(u, markerUniforms[u]);
+                }
             }
         }
         if (this._isTransparent()) {
@@ -1136,11 +1142,13 @@ export default class GLTFMarker extends Marker {
         return symbol && symbol.uniforms;
     }
 
-    setUniform(key, value) {
+    setUniform(key, value, nodeIndex) {
         const uniforms = this.getUniforms() || {};
         uniforms[key] = value;
         super.updateSymbol({ uniforms });
         this._uniformDirty = true;
+        this._uniformNodeIndex = this._uniformNodeIndex || {};
+        this._uniformNodeIndex[key] = nodeIndex;
         return this;
     }
 

packages/layer-gltf/test/FixBugSpec.js

@@ -2068,4 +2068,29 @@ describe('bug', () => {
         const vLayer = new maptalks.VectorLayer('v', { enableAltitude: true }).addTo(map);
         new maptalks.Marker([0, 0, 100]).addTo(vLayer);
     });
+
+    it('set uniform for specific nodeIndex(#issues/886)', done => {
+        const gltflayer = new maptalks.GLTFLayer('gltf');
+        const marker = new maptalks.GLTFGeometry(center, {
+            symbol: {
+                scaleX: 50,
+                scaleY: 50,
+                scaleZ: 50,
+                url: url2,
+                uniforms: {
+                    polygonFill: [1, 1, 1, 1],
+                    polygonOpacity: 1
+                }
+            }
+        }).addTo(gltflayer);
+        marker.on('load', () => {
+            marker.setUniform('polygonFill', [1, 0, 0, 1], 1);
+            setTimeout(function() {
+                const pixel = pickPixel(map, map.width / 2, map.height / 2, 1, 1);
+                expect(pixelMatch([168, 3, 3, 255], pixel)).to.be.eql(true);
+                done();
+            }, 100);
+        });
+        new maptalks.GroupGLLayer('gl', [gltflayer], { sceneConfig }).addTo(map);
+    });
 });