初始化灰化效果

assets/scripts/GrayEffectScene.ts

@@ -0,0 +1,59 @@
+const { ccclass, property } = cc._decorator;
+
+@ccclass
+export default class GrayEffectScene extends cc.Component {
+    private _grayLevelSlider: cc.Slider = null;
+    private _grayLevelSliderLabel: cc.Label = null;
+
+    private _examplesParentNode: cc.Node = null;
+
+    onLoad() {
+        this._grayLevelSlider = cc.find("Canvas/Content/Sliders/GrayLevelSlider/Slider").getComponent(cc.Slider);
+        this._grayLevelSliderLabel = cc.find("Canvas/Content/Sliders/GrayLevelSlider/ValueLabel").getComponent(cc.Label);
+
+        this._examplesParentNode = cc.find("Canvas/Content/Examples");
+    }
+
+    onEnable() {
+        this._grayLevelSlider.node.on("slide", this._onSliderChanged, this);
+    }
+
+    onDisable() {
+        this._grayLevelSlider.node.off("slide", this._onSliderChanged, this);
+    }
+
+    start() {
+        this._onSliderChanged();
+    }
+
+    private _onSliderChanged() {
+        this._grayLevelSliderLabel.string = `${this._grayLevelSlider.progress.toFixed(2)}`;
+
+        // 更新材质
+        this._updateRenderComponentMaterial({
+            oldLevel: this._grayLevelSlider.progress
+        });
+    }
+
+    /**
+     * 更新渲染组件的材质
+     *
+     * 1. 获取材质
+     * 2. 给材质的 unitform 变量赋值
+     * 3. 重新将材质赋值回去
+     */
+    private _updateRenderComponentMaterial(param: {
+        /**
+         * 灰化程度 [0.0, 1.0] ，1.0 表示完全灰化
+         */
+        oldLevel: number;
+    }) {
+        this._examplesParentNode.children.forEach(childNode => {
+            childNode.getComponents(cc.RenderComponent).forEach(renderComponent => {
+                let material: cc.Material = renderComponent.getMaterial(0);
+                material.setProperty("oldLevel", param.oldLevel);
+                renderComponent.setMaterial(0, material);
+            });
+        });
+    }
+}

assets/scripts/GrayEffectScene.ts.meta

@@ -0,0 +1,9 @@
+{
+  "ver": "1.0.5",
+  "uuid": "0b2ee60e-d226-44af-bfcf-95b75266e51f",
+  "isPlugin": false,
+  "loadPluginInWeb": true,
+  "loadPluginInNative": true,
+  "loadPluginInEditor": false,
+  "subMetas": {}
+}