In the example picture I passed per instance foliage positions into the pixel shader to add a cheap drop shadow on cuttable grass.
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UE4 tip: You can optimize materials for fill rate by moving instructions from the pixel shader into the vertex shader using "Custom UVs". Add custom UVs to your material output node, pack your VS data into UVs, then unpack and use in PS. #UE4 #GameDev #UE4tipspic.twitter.com/9KOrYOPgPR
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I've been schooled in an even better way of doing this:https://twitter.com/chadowrun/status/949347937250828288 …
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You should check out the interpolation node added in 4.16, it's removes the need for fiddling with custom UVs and inlines your graph. https://docs.unrealengine.com/latest/images/Support/Builds/ReleaseNotes/4_16/image_36.png … https://docs.unrealengine.com/latest/images/Support/Builds/ReleaseNotes/4_16/image_37.png …
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Oh hell yea! Even better. I just discovered the custom UV nodes yesterday, glad to see this cleans up the pack/unpack for you!
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noob question here... why does shifting compute time from the PS to VS make a difference in terms of performance?
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The vertex shader executes on the 3 points of a triangle and interpolates the values across it's surface, while the pixel shader executes for every pixel fragment that the triangle touches.
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Wydaje się, że ładowanie zajmuje dużo czasu.
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