jPCT-AE - a 3d engine for Android > Support
gpu bug ?
MichaelJPCT:
my project sometimes has 2 transparent objects(shadows) overlapping but at the same height.
on Powervr 6250 gpu , the objects flicker, like the behavior of Z-fighting. on maliT720, it doesn't happen.
it shouldn't happen because they are transparent, they should co-exist.
what might be the cause of Z-fighting and can it be fixed?
EgonOlsen:
Strange. Do you have a screenshot?
MichaelJPCT:
i don't have a way to take screenshots on that device yet, so i use real camera to shoot the imgs.
2 shadows are overlapping in these screenshots(the meshes holding the texture is much larger than the dark area of shadow).
shadows are at exact same height.
the shadow closer to camera flickers(always true).
EgonOlsen:
Might be an issue with rendering tiles on PowerVR. It would be interesting to know how wide these blocks are. I expect them to be 32 pixels...
MichaelJPCT:
i don't know the size of the flickering squares, but might be 32. the width of screen is 1920. the squares are axis-aligned to screen.
but the patterns of flicker are multiple, sometimes i see narrow bands. pattern changes with camera position and angle, not by time.
i tried setting usePowerVRTweaks to false, and the whole device hanged. i had to turn off power to reset it.
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