In Cocos Creator with CRP, is it possible to render specific objects into a RenderTexture after the forward pass but before post-processing? #18711

whaqzhzd · 2025-05-13T16:05:44Z

I have previously discussed this topic with Hyde Zhou on the Cocos forum, but I’d like to document it more formally here for future reference and potential feature consideration.

First, I have already implemented the following code:

 windowResize(
        ppl: rendering.BasicPipeline,
        pplConfigs: Readonly<PipelineConfigs>,
        cameraConfigs: Readonly<CameraConfigs & PickPassConfigs>,
        window: renderer.RenderWindow): void {
        const id = window.renderWindowId;
        if (cameraConfigs.enablePickOutliner) {
            const rtColorName = `PickRT${id}`;
            const rtDepthStencilName = `PickDS${id}`;

            ppl.addRenderTarget(rtColorName,
                cameraConfigs.radianceFormat,
                cameraConfigs.width,
                cameraConfigs.height);

            ppl.addDepthStencil(rtDepthStencilName,
                Format.DEPTH_STENCIL,
                cameraConfigs.width,
                cameraConfigs.height);
        }
    }
    setup(
        ppl: rendering.BasicPipeline,
        pplConfigs: Readonly<PipelineConfigs>,
        cameraConfigs: CameraConfigs & Readonly<PickPassConfigs>,
        camera: renderer.scene.Camera,
        context: PipelineContext,
        prevRenderPass?: rendering.BasicRenderPassBuilder): rendering.BasicRenderPassBuilder | undefined {
        if (!cameraConfigs.enablePickOutliner) {
            return prevRenderPass;
        }
        --cameraConfigs.remainingPasses;

        assert(!!this._material);

        const id = camera.window.renderWindowId;
        const rtColorName = `PickRT${id}`; 
        const rtDepthStencilName = `PickDS${id}`; 

        const renderPass = ppl.addRenderPass(cameraConfigs.width, cameraConfigs.height, "default");
        renderPass.name = "PickRTPass";
        renderPass.addRenderTarget(rtColorName, LoadOp.CLEAR, StoreOp.STORE, sClearColorTransparentBlack); 
        renderPass.addDepthStencil(
            rtDepthStencilName, 
            LoadOp.CLEAR,       
            StoreOp.DISCARD,      
            camera.clearDepth,
            camera.clearStencil,
            ClearFlagBit.DEPTH_STENCIL,
        );

        renderPass
            .addQueue(QueueHint.OPAQUE)
            .addScene(camera, SceneFlags.OPAQUE);

        const copyPass = ppl.addRenderPass(cameraConfigs.width, cameraConfigs.height, 'pick-pass');
        copyPass.addRenderTarget(cameraConfigs.colorName, LoadOp.CLEAR, StoreOp.STORE, sClearColorTransparentBlack);
        copyPass.addTexture(context.colorName, 'mainTexture');
        copyPass.addTexture(rtColorName, 'inputTexture');
        copyPass.setVec4('g_platform', pplConfigs.platform);
        copyPass
            .addQueue(rendering.QueueHint.OPAQUE)
            .addCameraQuad(camera, this._material!, 0);

        return copyPass; 
    }

But the problem is, I don't know how to use filtering to render only the objects I want! All of my objects use the same uber shader. I select them in the scene and get a list of them. So what should I do next?

It would be ideal if there were an API like ppl.addRenderPass(cameraConfigs.width, cameraConfigs.height, array<model>, passName); or something similar, because I already have the list of models. I don't need to loop through them again using a filter like:

for (const model of scene.models) {
    // do something or filter
}

Or something like:

renderPass
    .addQueue(QueueHint.OPAQUE)
    .addScene(camera, SceneFlags.OPAQUE)
    .addModel(array<model>, passId)

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In Cocos Creator with CRP, is it possible to render specific objects into a RenderTexture after the forward pass but before post-processing? #18711

In Cocos Creator with CRP, is it possible to render specific objects into a RenderTexture after the forward pass but before 8000 post-processing? #18711

In Cocos Creator with CRP, is it possible to render specific objects into a RenderTexture after the forward pass but before post-processing? #18711

In Cocos Creator with CRP, is it possible to render specific objects into a RenderTexture after the forward pass but before 8000 post-processing? #18711

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