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Erase from Rendertexture


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Hello, I'm wondering how to erase something from a rendertexture. I don't want to clear the whole thing and it might not necessarily be a rectangle. (for rectangles I found http://www.html5gamedevs.com/topic/9031-trying-to-build-a-paint-application-with-pixi/#entry54977)


Usually I would try to disable all blendmodes and draw transparent stuff onto the rendertexture, but blendModes.NORMAL still does alpha blending, so it doesn't change anything to the texture.

Is there a way of doing this?



For the WebGL renderer I discovered that this works:

renderer.renderSession.gl.disable(renderer.renderSession.gl.BLEND);//draw with alpha 0renderer.renderSession.gl.enable(renderer.renderSession.gl.BLEND);

How would you do it with the Canvas renderer? Thanks

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  • 2 months later...

What is behind the rendertexture, does it have a static background, or there are things moving behind it? If it has a static texture as a background, then instead of erasing, you can draw that bg texture on the rendertexture, masked with the brush sprite.

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