Slowdown of texture painting #47635

New Issue

Alex · 2016-03-01T00:05:58+01:00

Alex commented

2016-03-01 00:05:58 +01:00

System Information
Intel Core i7 / Intel Core i5 / Intel Core 2 Quad
8 Gb RAM
Nvidia GeForce GTX 760 / Nvidia GeForce GTX 960 / Ati Radeon HD 7700
Windows 7 x64

Blender Version
Broken: 2.77 298aac3
Worked: 2.76b f337fea

Short description of error
Version 2.77 seems to have a serious slowdown in texture painting mode.

Exact steps for others to reproduce the error

Create an empty scene and add a simple plane
Switch to texture painting mode, add simple UVs and 8192x8192 diffuse texture
Try making a few long curved strokes with small or middle sized brush

If you reproduce these steps in 2.76 you will notice that brush lags only at the very beginning of the stroke and then works smoothly; in 2.77 brush will lag all the time during the stroke. What's worse - brush will frequently skip, making a series of straight segments which makes it very difficult to draw curved lines. I have tried this on several different machines with different CPU and GPU combinations and it seems to work like this every time. I have also noticed that small brush works significantly faster in 2.76 while in 2.77 small brush lags just as much as a big one.

**System Information** Intel Core i7 / Intel Core i5 / Intel Core 2 Quad 8 Gb RAM Nvidia GeForce GTX 760 / Nvidia GeForce GTX 960 / Ati Radeon HD 7700 Windows 7 x64 **Blender Version** Broken: 2.77 298aac3 Worked: 2.76b f337fea **Short description of error** Version 2.77 seems to have a serious slowdown in texture painting mode. **Exact steps for others to reproduce the error** 1. Create an empty scene and add a simple plane 2. Switch to texture painting mode, add simple UVs and 8192x8192 diffuse texture 3. Try making a few long curved strokes with small or middle sized brush If you reproduce these steps in 2.76 you will notice that brush lags only at the very beginning of the stroke and then works smoothly; in 2.77 brush will lag all the time during the stroke. What's worse - brush will frequently skip, making a series of straight segments which makes it very difficult to draw curved lines. I have tried this on several different machines with different CPU and GPU combinations and it seems to work like this every time. I have also noticed that small brush works significantly faster in 2.76 while in 2.77 small brush lags just as much as a big one.

Alex commented

2016-03-01 00:05:58 +01:00

Changed status to: 'Open'