Weird Shadows on viewport (solid mode) #59121

New Issue

Henrique Balduino Gonzaga · 2018-12-10T14:37:36+01:00

Henrique Balduino Gonzaga commented

2018-12-10 14:37:36 +01:00

System Information
Operating system: Windows 10 64x
Graphics card: Geforce GTX 1070

Blender Version
Broken: 2.8 e79bb957fc

Short description of error

Tha shadows beeing cast are not acting like shadows. They should be on the plane, but they are like... flying?

Casa.blend

**System Information** Operating system: Windows 10 64x Graphics card: Geforce GTX 1070 **Blender Version** Broken: 2.8 e79bb957fc3 **Short description of error** Tha shadows beeing cast are not acting like shadows. They should be on the plane, but they are like... flying? ![image.png](https://archive.blender.org/developer/F5910401/image.png) ![image.png](https://archive.blender.org/developer/F5910407/image.png) ![image.png](https://archive.blender.org/developer/F5910410/image.png) ![image.png](https://archive.blender.org/developer/F5910412/image.png) [Casa.blend](https://archive.blender.org/developer/F5910416/Casa.blend)

Henrique Balduino Gonzaga commented

2018-12-10 14:37:36 +01:00

Added subscriber: @HenriqueGonzaga

Jacques Lucke commented

2018-12-10 14:47:02 +01:00

Added subscriber: @JacquesLucke

Clément Foucault was assigned by Jacques Lucke

2018-12-10 14:47:02 +01:00

Jacques Lucke commented

2018-12-10 14:47:02 +01:00

I also get weird artifacts when the (viewport) camera is close to the ground plane. Looks like z-fighting.

Clément Foucault commented

2018-12-11 01:28:56 +01:00

The issue described in this report has been fixed by 3dfbb72b29.

The issue with the floor is really strange. It happens only if one corner is behind the camera near clip plane.

Also editing the mesh (extruding and deleting the created verts) fix the issue. I am not sure why this is happening. Maybe the issue is in the mesh itself. I'll debug more latter.

The issue described in this report has been fixed by 3dfbb72b29. The issue with the floor is really strange. It happens only if one corner is behind the camera near clip plane. Also editing the mesh (extruding and deleting the created verts) fix the issue. I am not sure why this is happening. Maybe the issue is in the mesh itself. I'll debug more latter.

Clément Foucault commented

2019-03-20 02:40:04 +01:00

Changed status from 'Open' to: 'Resolved'

Clément Foucault closed this issue

2019-03-20 02:40:04 +01:00

Clément Foucault commented

2019-03-20 02:40:04 +01:00

The main issue reported has been fixed.

As for the floor problem, it's floating precision issue caused by depth interpolation when rendering the shadow "caps" while a backfacing triangle intersect the near plane. It gets clipped and the GPU generate 1 to 3 triangles that (for some reason I ignore) are not exactly the same as the triangle that was rasterized in the prepass. And since we render the cap with a "greater or equal" depth test, some of the fragments are being discarded.

I would consider that an implementation limitation at this point but it might be solved in the future if we change the whole rendering of shadows for workbench.

So bottom line is, don't zoom on backfacing polygons when the shadows are enabled, or avoid backfacing polygon .

The main issue reported has been fixed. As for the floor problem, it's floating precision issue caused by depth interpolation when rendering the shadow "caps" while a backfacing triangle intersect the near plane. It gets clipped and the GPU generate 1 to 3 triangles that (for some reason I ignore) are not exactly the same as the triangle that was rasterized in the prepass. And since we render the cap with a "greater or equal" depth test, some of the fragments are being discarded. I would consider that an implementation limitation at this point but it might be solved in the future if we change the whole rendering of shadows for workbench. So bottom line is, don't zoom on backfacing polygons when the shadows are enabled, or avoid backfacing polygon .

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Weird Shadows on viewport (solid mode) #59121