allow skipping the rtt initial clearing

This is important in XR scenarios
wuqianju · Aug 23, 2021 · 7dcc937 · 7dcc937
1 parent 9574b5a
commit 7dcc937
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/src/Materials/Textures/renderTargetTexture.ts b/src/Materials/Textures/renderTargetTexture.ts
@@ -237,6 +237,10 @@ export class RenderTargetTexture extends Texture {
     public _generateMipMaps: boolean;
     /** @hidden */
     public _cleared = false;
+    /**
+     * Skip the initial clear of the rtt at the beginning of the frame render loop
+     */
+    public skipInitialClear = false;
     protected _renderingManager: RenderingManager;
     /** @hidden */
     public _waitingRenderList?: string[];

diff --git a/src/scene.ts b/src/scene.ts
@@ -4001,7 +4001,7 @@ export class Scene extends AbstractScene implements IAnimatable, IClipPlanesHold
             const rtt = camera.outputRenderTarget;
             if (rtt.onClearObservable.hasObservers()) {
                 rtt.onClearObservable.notifyObservers(this._engine);
-            } else {
+            } else if (!rtt.skipInitialClear) {
                 this._engine.clear(rtt.clearColor || this.clearColor, !rtt._cleared, true, true);
                 rtt._cleared = true;
             }