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TSM and Mirrors

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Hello! How is TSM handled with mirrors? A mirror, like a reflecting water plane, would change the shape of the 'view area' so it's not really a frustum anymore, but a union of frustums (I *think*) - hence the trapezoidal transformation doesn't work as expected anymore. So what's the best way to tackle this problem? seperate shadow maps for the normal and the mirrored frustum? a special transformation for the union of them? any convincing hacks that might work too?

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