Fix particles facing the wrong direction - #616
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- On the CPU side, change the order of vertices to form counterclockwise triangles - On the GPU side, compensate this change by reversing relevant cross products
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Tested on many particle systems. Every mode looks correct on everything I tested, except some particle systems in Direction mode. Some look correct (like the rain in Shadowed Cove), others look mostly correct but are rotated 90⁰ (the Tux particle spray from #585 ).