Blender becomes a lot much slower with parentheses in driver expression #67158

New Issue

Loux · 2019-07-18T07:55:29+02:00

Loux commented

2019-07-18 07:55:29 +02:00

System Information
Operating system: Windows 10 - 64bits
Graphics card: GeForce RTX 2070
Processor: AMD Ryzen 7 2700X (3.7 GHz)
Ram: 32.0 Go

Blender Version
Broken: (v2.80, Release Candidate)

Short description of error
Hello !
On my main project I work with a lot of drivers for my rigs and I use a lot of math. but in the expression of my driver when I add parentheses blender becomes a lot much slower.. :/

Thanks,

Exact steps for others to reproduce the error
ErrorShare.blend

Open the file
Play Animation with Eevee Render
Select Armature and go in pose mode
Add Driver on X rotation on the bone d_World (The big in center on the floor)
Remove driver variables and change driver expression for 1+2 (On my compunter, 1080p full screen Blender turn at 60fps)
Change driver expression for (1+2) (On my compunter, 1080p full screen Blender turn now at 9fps...)

**System Information** Operating system: Windows 10 - 64bits Graphics card: GeForce RTX 2070 Processor: AMD Ryzen 7 2700X (3.7 GHz) Ram: 32.0 Go **Blender Version** Broken: (v2.80, Release Candidate) **Short description of error** Hello ! On my main project I work with a lot of drivers for my rigs and I use a lot of math. but in the expression of my driver when I add parentheses blender becomes a lot much slower.. :/ Thanks, **Exact steps for others to reproduce the error** [ErrorShare.blend](https://archive.blender.org/developer/F7615966/ErrorShare.blend) - Open the file - Play Animation with Eevee Render - Select Armature and go in pose mode - Add Driver on X rotation on the bone d_World (The big in center on the floor) - Remove driver variables and change driver expression for **1+2** (On my compunter, 1080p full screen Blender turn at 60fps) - Change driver expression for **(1+2)** (On my compunter, 1080p full screen Blender turn now at 9fps...)

Loux commented

2019-07-18 07:55:29 +02:00

Added subscriber: @BleuRaven

Jeroen Bakker commented

2019-07-18 08:42:07 +02:00

Added subscriber: @Jeroen-Bakker

Jeroen Bakker commented

2019-07-18 08:42:07 +02:00

Hi @BleuRaven

Could you mention the performance compared to Blender 2.79
Blender 2.80 recognizes several basic expressions and evaluate these expressions in C in stead of Python, what is way much faster.
Parentheses are not part of these expressions and will be evaluated in Python.
bf2a54b058

If this is the case than this is not a Bug, but how the system is designed to work.

Hi @BleuRaven Could you mention the performance compared to Blender 2.79 Blender 2.80 recognizes several basic expressions and evaluate these expressions in C in stead of Python, what is way much faster. Parentheses are not part of these expressions and will be evaluated in Python. bf2a54b058 If this is the case than this is not a Bug, but how the system is designed to work.

Loux commented

2019-07-18 19:39:55 +02:00

Oh ok I understand better, Thanks
I can not test with Eevee Render in Blender 2.7 so it works in both cases at 60 fps
I think it would be useful to add a indication in driver Editor to tell the user if his expression is compute with Python or C

Oh ok I understand better, Thanks I can not test with Eevee Render in Blender 2.7 so it works in both cases at 60 fps I think it would be useful to add a indication in driver Editor to tell the user if his expression is compute with Python or C

Bastien Montagne commented

2019-07-29 18:31:41 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2019-07-29 18:31:41 +02:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2019-07-29 18:31:41 +02:00

Bastien Montagne self-assigned this 2019-07-29 18:31:41 +02:00

Bastien Montagne commented

2019-07-29 18:31:41 +02:00

Thanks, not a bug then, archiving.

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Blender becomes a lot much slower with parentheses in driver expression #67158