I'm trying to make the projection painting of the face texture over the old one,but the new image texture is not transparent enough and I'm not able to see behind. How can I make it more transparent ? thanks...
3 Answers
You can look in the properties panel under the tool and see the panel 'Display' and open that, and there you can set the stencil brush opacity and toggle it to disappear on stroke.

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$\begingroup$ thanks. is there some shortcuts to rotate,scale,transform the texture ? I see that I can modify the angle,the size etc but I find that using that method is not comfortable. $\endgroup$– MariettoApr 15, 2019 at 15:49
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$\begingroup$ Yes, explore what happens with RMB to to move, Shift-RMB to Scale, and Ctrl-RMB to rotate. $\endgroup$ Apr 15, 2019 at 19:40
Blender v2.83
When you are in Texture Paint mode in the 3D Viewport and are using a texture as a stencil for the Draw tool, you can adjust the opacity of the image which displays when you use the tool. This is found under the Cursor setting, detailed below.
Using a texture as a stencil
- Open the
3D Viewportand set the mode toTexture Paint. - Select the Draw tool.
- Open the
Properties Editor-> select theActive Tool and Workspace settingstab ->Brush Settings->Texture-> and change the following :
[] set the texture, or locate an image for the texture here,
[] set the dropdown for Mapping -> to "Stencil"
Changing the visual opacity of the stencil
There are 2 locations (as of Blender v2.83) to change the visual opacity of the stencil (note, this is different from the strength of the tool, and this is also different from the Stencil Mask)
Select the Draw tool in the 3D Viewport while in Texture Paint mode.
Then find the setting at either of the following locations:
3D Viewport->Sidebar->Tooltab ->Brush Settingspanel ->Cursor->Texture Opacity
Properties Editor->Active Tool and Workspace settingstab ->Brush Settings->Cursor->Texture Opacity
Word of caution :
The following setting will not affect the opacity of the Stencil which displays under your cursor when using a Texture Stencil as described above.
The following setting affects the Stencil Mask opacity:
3D Viewport->Texture Paint mode->Show Overlays(just below the Header's Menu) -> dropdown options ->Texture Paint->Stencil Opacity
The Stencil Mask can be toggled on in the Overlay options via :
3D Viewport->Texture Paint mode->HeaderMenu ->MaskingDropdown ->Stencil Maskcheckbox.
The following animated gif demonstrates the difference between the Cursor's Texture Opacity setting (the answer I gave above to Marietto's question),
from the settings affecting the Stencil Mask:



