How to use multi renderTarget.I want to achieve transmission effect

Help & Support
#1

I checked the source code of others engines,I found they use the opaque meshs render result as a texture to the transmission extensions shader.
I want to get render result，when like the scene is rendered with half of the meshs.and I found some function like setCamera() and renderForward() this is the rendering core?
Maybe I can use a new layer to save the render result.but will this increase rendering pressure.

#2

If the question is how to render to a render target, we have some examples:

http://playcanvas.github.io/#/graphics/render-to-texture
https://developer.playcanvas.com/en/tutorials/resolution-scaling/
https://developer.playcanvas.com/en/tutorials/capturing-a-screenshot/

#3

Ho @yaustar.

You can check the bloom effect on how it uses multiple render targets:

https://playcanvas.github.io/#/graphics/post-effects

And here is the code:

#4

thinks,These are the results of the rendering of the current frame after the rendering is completed，I want to get obtain the current result directly during rendering.

#5

This is the example you’re looking for
http://playcanvas.github.io/#/graphics/grab-pass

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#6

Thanks, this should help me.

#7

Note that at the moment, each time a material with texture_grabPass texture is used, a backbuffer is copied to a texture, which is not cheap. We do not have a feature where this copy takes place only one time (after all opaque meshes), allowing you to use the same texture multiple times.

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