Grab and Rotate in Front view mini bug #76629

New Issue

Zubenelgennubi · 2020-05-11T06:47:39+02:00

Zubenelgennubi commented

2020-05-11 06:47:39 +02:00

System Information
Operating system: win 10 64bit
Graphics card: gtx 960

Blender Version
Broken: 2.82 release 2.83 beta and 2.90a 2020-05-10

Grab and Rotate object in Front view(Num 1) and Back view(Ctrl Num1) not actually flat on Y plane, in both Object mode and Edit mode.
Exact steps for others to reproduce the error
1.Grab : in Object mode select object > Num 1 to Front view > G to grab and move object somewhere > Y plane get bump, not flat.

2.Rotate : in Object mode select object > Num 1 to Front view > R to Rotate and rotate object somewhere > Z plane get bump, not flat.

Same thing happen in Edit mode.

Other view plane not have this issues.

**System Information** Operating system: win 10 64bit Graphics card: gtx 960 **Blender Version** Broken: 2.82 release 2.83 beta and 2.90a 2020-05-10 Grab and Rotate object in Front view(Num 1) and Back view(Ctrl Num1) not actually flat on Y plane, in both Object mode and Edit mode. **Exact steps for others to reproduce the error** 1.Grab : in Object mode select object > Num 1 to Front view > G to grab and move object somewhere > Y plane get bump, not flat. ![e0.jpg](https://archive.blender.org/developer/F8527238/e0.jpg) ![e1.jpg](https://archive.blender.org/developer/F8527240/e1.jpg) 2.Rotate : in Object mode select object > Num 1 to Front view > R to Rotate and rotate object somewhere > Z plane get bump, not flat. ![e0.jpg](https://archive.blender.org/developer/F8527238/e0.jpg) ![Er1.png](https://archive.blender.org/developer/F8527249/Er1.png) Same thing happen in Edit mode. Other view plane not have this issues. ![en.png](https://archive.blender.org/developer/F8527260/en.png)

Zubenelgennubi commented

2020-05-11 06:47:39 +02:00

Added subscriber: @zubenelgennubi

blender-admin commented

2020-05-11 06:47:39 +02:00

#91575 was marked as duplicate of this issue

blender-admin commented

2020-05-11 06:47:39 +02:00

#91170 was marked as duplicate of this issue

Alaska commented

2020-05-11 06:56:40 +02:00

Added subscriber: @Alaska

Alaska commented

2020-05-11 06:56:40 +02:00

I can also confirm this happens.

Pasang Bomjan commented

2020-05-11 08:04:59 +02:00

Added subscriber: @Pasang

Pasang Bomjan commented

2020-05-11 08:04:59 +02:00

For me in blender 2.90, while rotating in front and back ortho, X and Z values bump.
See #75596 and #75628. They were somewhat related.

For me in blender 2.90, while rotating in front and back ortho, X and Z values bump. See #75596 and #75628. They were somewhat related.

Ankit Meel commented

2020-05-11 12:55:55 +02:00

Added subscriber: @ankitm

Richard Antalik commented

2020-05-11 13:37:03 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-05-11 13:37:03 +02:00

The fact that this happens only in front view is quite strange, though this seems to happen in all previous versions, so I would believe this is technical limitation somehow.

Germano Cavalcante commented

2020-05-12 15:54:13 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-05-12 15:54:13 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Germano Cavalcante commented

2020-05-12 15:54:13 +02:00

This is a problem with the float precision.
The viewport itself is not exactly aligned.
Solving this is not a simple task, we would have to use doubles in many areas.
So marking as Known Issue

This is a problem with the float precision. The viewport itself is not exactly aligned. Solving this is not a simple task, we would have to use doubles in many areas. So marking as `Known Issue`

Campbell Barton commented

2020-06-17 05:22:59 +02:00

Added subscriber: @ideasman42

Campbell Barton commented

2020-06-17 05:22:59 +02:00

Changed status from 'Confirmed' to: 'Archived'

Campbell Barton closed this issue

2020-06-17 05:22:59 +02:00

Campbell Barton self-assigned this 2020-06-17 05:22:59 +02:00

Campbell Barton commented

2020-06-17 05:22:59 +02:00

Closing since this isn't something we will address, therefor there is no use in keeping it open.

Germano Cavalcante commented

2021-09-08 17:32:27 +02:00

Added subscriber: @Rodrigo-Saure

Germano Cavalcante commented

2021-09-08 17:42:00 +02:00

@ideasman42, although a definitive solution is not feasible, we can alleviate the problem by making rv3d->viewmat more accurate.
A workaround that would solve these cases of aligned View could be:

diff --git a/source/blender/blenlib/intern/math_rotation.c b/source/blender/blenlib/intern/math_rotation.c
index 34baac6f2a4..1ef612eff17 100644
--- a/source/blender/blenlib/intern/math_rotation.c
+++ b/source/blender/blenlib/intern/math_rotation.c
@@ -284,10 +284,10 @@ void quat_to_mat4(float m[4][4], const float q[4])
   }
 #endif
 
-  q0 = M_SQRT2 * (double)q[0];
-  q1 = M_SQRT2 * (double)q[1];
-  q2 = M_SQRT2 * (double)q[2];
-  q3 = M_SQRT2 * (double)q[3];
+  q0 = (double)((float)M_SQRT2 * q[0]);
+  q1 = (double)((float)M_SQRT2 * q[1]);
+  q2 = (double)((float)M_SQRT2 * q[2]);
+  q3 = (double)((float)M_SQRT2 * q[3]);
 
   qda = q0 * q1;
   qdb = q0 * q2;

IMHO, given the number of reports, it might be worth considering implementing these workarounds.

@ideasman42, although a definitive solution is not feasible, we can alleviate the problem by making `rv3d->viewmat` more accurate. A workaround that would solve these cases of aligned View could be: ``` diff --git a/source/blender/blenlib/intern/math_rotation.c b/source/blender/blenlib/intern/math_rotation.c index 34baac6f2a4..1ef612eff17 100644 --- a/source/blender/blenlib/intern/math_rotation.c +++ b/source/blender/blenlib/intern/math_rotation.c @@ -284,10 +284,10 @@ void quat_to_mat4(float m[4][4], const float q[4]) } #endif - q0 = M_SQRT2 * (double)q[0]; - q1 = M_SQRT2 * (double)q[1]; - q2 = M_SQRT2 * (double)q[2]; - q3 = M_SQRT2 * (double)q[3]; + q0 = (double)((float)M_SQRT2 * q[0]); + q1 = (double)((float)M_SQRT2 * q[1]); + q2 = (double)((float)M_SQRT2 * q[2]); + q3 = (double)((float)M_SQRT2 * q[3]); qda = q0 * q1; qdb = q0 * q2; ``` IMHO, given the number of reports, it might be worth considering implementing these workarounds.

Richard Antalik commented

2021-09-22 21:21:36 +02:00

Added subscribers: @mahdishalchian, @PratikPB2123

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Grab and Rotate in Front view mini bug #76629