cursor surface project innacuracy #59890
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Reference: blender/blender#59890
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Win10, GTX1080
Broken: 2.80, 2018-12-26 22:09,
e4dbfe0a98
Worked: 2.79
Cursor surface project is not as accurate as in 2.79, especially when projection is at a steep angle:
It's better when projected at a shallow angle, although still not perfect:
Added subscriber: @MarcinTwarowski
Added subscriber: @ZedDB
I can not reproduce this with the default cube. The cursor seems to snap to the cube sides.
On my end the error seem to be minimal. Cube sides are located at 1.0, the cursor snaps to ~1.0005.
What error range do you observe?
It depends on zoom level. From around 1.001 / 1.002
up to 1.01 when I zoom out.
For comparison, in 2.79:
Added subscriber: @fclem
I'm guessing that the snapping is using the depth buffer to do this. So inaccuracies will happen. @fclem known limitation or not?
Added subscriber: @mano-wii
We could use raycast.
But currently the raycast only works for the Mesh type objects.
And also depending on the Mesh, it can take up a lot of memory space.
However, when you enable the
Cursor
tool, you can change the orientation fromView
toGeometry
.That way it will use raycast. But it will not work well for example with
MetaBall
objects.A general solution is complicated. I think it best to let the user work around the problem by using the snap or by choosing the
Cursor
tool plusGeometry
orientation.@mano-wii So this is more of a limitation than a bug? What is strange is that it was also working with metaballs in blender 2.79 without the precision loss.
The depth accuracy at 2.79 was greater but the technique used for projection in both
Metaball
andMeshes
wasglUnProject
and not raycast.However, I did a test again and realized that in Blender 2.8 objects such as
Camera, GreasePencil, Empty and Bones
are being ignored in the Cursor projection.If this is not considered a regression, then we can use raycast, since only
Meshes
are affected.Perhaps by increasing the resolution of the texture used for depth drawing, the projection will match that of blender 2.79 (but not as good as raycast).
This issue was referenced by
1f1e90a013
Changed status from 'Open' to: 'Resolved'