Flow particle_size range is too limiting #80564

New Issue

Stefano Lazzaroni · 2020-09-07T15:30:27+02:00

Stefano Lazzaroni commented

2020-09-07 15:30:27 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: AMD Radeon R9 200 Series ATI Technologies Inc. 4.5.13587 Core Profile Context 20.2.2 26.20.15019.19000

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-04 21:32, hash: cf0ba59e31
Worked: (newest version of Blender that worked as expected)

Short description of error
While testing Mantaflow i discovered that some values are clamped for apparently no reason. I was doing some tests with particle system as smoke inflows. According to the documentation , the field Size "When this setting is enabled, it allows the Size setting to define the maximum distance in voxels at which particles can emit smoke, similar to the Surface Emission setting for mesh sources.". It is clamped to 20 but we could want to go higher and i don't see any user motivation to clamp this value (as the domain resolution clamped to 10000 instead of letting it unclamped). Here is a video:
0000-0150.mp4

As you can see i was trying to check the different results with different resolution and cell sizes. Why should i not be able to for a 30 or 50 cell size value? In fact, higher domain resolution causes a better and physically accurated simulation.

If there are no limitation due to real problems, i suggest to let the user decide the maximum value needed. In the other hand, if there is a reason to clamp the value so write it in the documentation.

(Sorry for my english, i don't wanna sound arrogant or disrespectful, i'm very proud of mantaflow and i want to improve it as much as i can)

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: AMD Radeon R9 200 Series ATI Technologies Inc. 4.5.13587 Core Profile Context 20.2.2 26.20.15019.19000 **Blender Version** Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-04 21:32, hash: `cf0ba59e31` Worked: (newest version of Blender that worked as expected) **Short description of error** While testing Mantaflow i discovered that some values are clamped for apparently no reason. I was doing some tests with particle system as smoke inflows. According to the [documentation ](https://docs.blender.org/manual/en/dev/physics/fluid/type/flow.html#flow-source), the field Size "When this setting is enabled, it allows the Size setting to define the maximum distance in voxels at which particles can emit smoke, similar to the Surface Emission setting for mesh sources.". It is clamped to 20 but we could want to go higher and i don't see any user motivation to clamp this value (as the domain resolution clamped to 10000 instead of letting it unclamped). Here is a video: [0000-0150.mp4](https://archive.blender.org/developer/F8850731/0000-0150.mp4) As you can see i was trying to check the different results with different resolution and cell sizes. Why should i not be able to for a 30 or 50 cell size value? In fact, higher domain resolution causes a better and physically accurated simulation. If there are no limitation due to real problems, i suggest to let the user decide the maximum value needed. In the other hand, if there is a reason to clamp the value so write it in the documentation. (Sorry for my english, i don't wanna sound arrogant or disrespectful, i'm very proud of mantaflow and i want to improve it as much as i can)

Stefano Lazzaroni commented

2020-09-07 15:30:27 +02:00

Added subscriber: @Lazza

Richard Antalik changed title from ~~Mantaflow: clamped values limit mantaflow power~~ to Flow particle_size range is too limiting

2020-09-11 05:48:43 +02:00

Richard Antalik commented

2020-09-11 05:48:43 +02:00

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

blender-admin commented

2020-09-14 12:01:44 +02:00

This issue was referenced by 61abd77648

This issue was referenced by 61abd776487eeb383833f95d602e318e59f42395

Jacques Lucke commented

2020-09-14 12:02:34 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Jacques Lucke closed this issue

2020-09-14 12:02:34 +02:00

Jacques Lucke self-assigned this 2020-09-14 12:02:34 +02:00

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Flow particle_size range is too limiting #80564