Custom render target size

I’m trying to render a sprite sheet of various 3D particles to use in VFX, but I’m having trouble defining the size of the render target. After I change the size, it squashes the rendered image. I’m guessing I have to change the aspect ratio of the view frustum to match the render target, but is that even possible?

not sure I get what result do you need exactly

I just wanted to render 3D elements into a square texture. I got it to work in the end, but it’s a little annoying to rescale all of the 3D elements to fit the aspect ratio.

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