Drawing Canvas Alpha At

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- newt
- - Joined 12 Nov, 2008
  - 396 topics • 10,741 posts
- 1
- 3 May, 2021
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Im trying to set a z height using a depth map via its alpha by pasting a texture in to a Drawing Canvas.

For some reason the alpha xy seems to be way off.

In the project note the z setting:

DrawingCanvas.SnapshotAlphaAt(loopindex("x")*2, loopindex("y")*2)

Pretty sure it shouldn't need the 2 multiplier.

dropbox.com/s/4atjjs78e3ko987/zhand.c3p
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- dop2000
- - Joined 26 May, 2016
  - 139 topics • 12,612 posts
- 1
- 4 May, 2021
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You need to account for PixelScale, it changes with window size and the image in the DrawingCanvas is interpolated. See this example:

dropbox.com/s/u59b4ogf0vwo4lm/BitmapToTilemap.c3p
PS: Can you post the final result? This 3D hand should look really cool.
- newt
- - Joined 12 Nov, 2008
  - 396 topics • 10,741 posts
- 1
- 4 May, 2021
- Quote
That will be the final result. It was just a depth map I found on the web and converted to alpha. I have adjusted the upload with PixelScale however.

Basically I was testing if I could use heightmaps, and it looks pretty promising, but there are some issues. I'm not sure if its z fighting, or just needing some interpolation.

Speaking of interpolation, that would look pretty bad as$ if the z was animated.

Thanks for the tip.