Viewport Zoom Issues #59103

New Issue

Chris Malcheski · 2018-12-10T03:37:18+01:00

Chris Malcheski commented

2018-12-10 03:37:18 +01:00

System Information
Operating system: Windows 10 Pro
Graphics card: nVidia RTX 2080

Blender Version
Broken: 2.80
Worked: -nothing-

Short description of error

The attached .blend file is set up exactly as required to jump straight to reproducing the error. On my system, for exactly 4 "clicks" of the mouse wheel forward (zoom in), the object highlighted vanishes. On the 5th click it reappears. Load the file, do nothing else but move the mouse wheel to zoom in for 5 clicks (notches) of the wheel. 1-4 will see the object vanish. 5 will show it reappear. Problem occurs in wireframe, loaddev, and solid modes but not in rendered (with cycles engine). The problem has to do with the object's position relative to the camera but it still should not vanish like it does. Bug 2.blend

**System Information** Operating system: Windows 10 Pro Graphics card: nVidia RTX 2080 **Blender Version** Broken: 2.80 Worked: -nothing- **Short description of error** The attached .blend file is set up exactly as required to jump straight to reproducing the error. On my system, for exactly 4 "clicks" of the mouse wheel forward (zoom in), the object highlighted vanishes. On the 5th click it reappears. Load the file, do nothing else but move the mouse wheel to zoom in for 5 clicks (notches) of the wheel. 1-4 will see the object vanish. 5 will show it reappear. Problem occurs in wireframe, loaddev, and solid modes but not in rendered (with cycles engine). The problem has to do with the object's position relative to the camera but it still should not vanish like it does. [Bug 2.blend](https://archive.blender.org/developer/F5905675/Bug_2.blend)

Chris Malcheski commented

2018-12-10 03:37:18 +01:00

Added subscriber: @CMalcheski

Jacques Lucke commented

2018-12-10 15:07:12 +01:00

Added subscribers: @fclem, @JacquesLucke

Jacques Lucke commented

2018-12-10 15:07:12 +01:00

I do get some strange shading bugs when in LookDev mode in this file but I can't exactly reproduce what you are talking about. Could you make a short .gif or video that shows the problem?

I do get some strange shading bugs when in LookDev mode in this file but I can't exactly reproduce what you are talking about. Could you make a short .gif or video that shows the problem? ![shading bug.gif](https://archive.blender.org/developer/F5910597/shading_bug.gif)

Clément Foucault commented

2018-12-10 15:37:50 +01:00

There is depth buffer precision issue when working in orthographic view since it uses only the far clip distance doubled.

Also I can see what @CMalcheski is describing. I think it comes from the culling of the object bounds box that gets really imprecise.

There is depth buffer precision issue when working in orthographic view since it uses only the far clip distance doubled. Also I can see what @CMalcheski is describing. I think it comes from the culling of the object bounds box that gets really imprecise.

Chris Malcheski commented

2018-12-10 15:55:40 +01:00

Floating point values by nature are imprecise. Blender has to do so much manipulation of values, especially where zoom is concerned, that the tiny amount that values are off as you get closer to bit 0 in a floating point value is going to amplify and amplify. You could move to double precision floats if you're not already using them but that's a major rework. At any rate little can be done about it. IEEE specifications for floating point format inherently allow for the kind of drift being seen. If I knew that was the issue, I would not have submitted this as a bug.