Elena Rossi
While working on a tattoo design on a model in Blender 2.83, a user noted the absence of an erase function, akin to those found in drawing programs like Krita. Blender does not support image layers, and therefore, does not offer a traditional eraser tool for texture painting. However, there are a few workarounds to erase or reset your work in Blender. One option is to use the Erase Alpha setting, although this will only make your work transparent rather than erasing it. Alternatively, you can use the Ctrl-Z shortcut to undo your last actions, but this depends on the number of undo steps you've set in your preferences. If you want to reset your weight paint, you can follow these steps: Weight Paint Mode -> 3D View Header -> Weights -> Clean. You can also enter edit mode, select the parts of the mesh where weight changes are needed, and set the weight slider to 0 before pressing Assign.
| Characteristics | Values |
|---|---|
| Blender version | 2.83 |
| Use case | Erasing a tattoo on a model |
| Brush settings | Erase Alpha |
| Alternative methods | Undo last actions with Ctrl+Z |
| Weight paint mode | Weights -> Clean |
| Weight paint precautions | Weight paint does not wet only vertex; clicking on the vertex makes it dark; mirror side is not wet |
| Subtract blend mode | Removes specified weight from vertex weights |
| Lighten blend mode | Interprets specified weight value as the target weight; only affects weights below the target |
| Blur blend mode | Smooths out weighting of adjacent vertices |
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What You'll Learn
Use the Erase Alpha setting in the brush options
The ""Erase Alpha" brush in the Image Editor of Blender is used to erase all channels of float images. However, it has been observed that the brush also ends up erasing the RGB channels, which is not the intended behaviour. This issue has been reported as a bug. To reproduce the bug, you can use the "Erase Alpha" brush on a floating-point image, and you will notice that all channels, including the RGB channels, are erased.
To work around this bug when trying to erase restraints in wedge paint in Blender, you can use the "Erase Alpha" brush in combination with specific colour settings. Firstly, ensure that your colour is not black, as black represents 0, and you will end up subtracting nothing from your alpha. Changing the colour to white is recommended. Additionally, make sure that your material setting's Alpha blending mode is set to something other than Opaque.
It is important to note that this issue might be specific to certain versions of Blender, and updates or patches may have been released to address it. Therefore, it is advisable to check for any available updates or patches for your version of Blender before attempting to use the "Erase Alpha" brush.
While using the "Erase Alpha" brush, you can also try using the ""Shift-Click" function to sample the pixel values of the image. This can help you verify if the RGB channels have been affected or if it is only a display issue.
By following these steps and adjusting your brush options, you can effectively use the "Erase Alpha" setting to erase restraints in wedge paint in Blender.
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Undo recent actions with Ctrl+Z
Blender has an
You can roll back to a specific point by picking from this list of recent actions. To undo your last action, press Ctrl-Z. To roll back the undo action, press Shift-Ctrl-Z or Ctrl-Shift-Z.
The Repeat History feature works similarly to the Undo History but contains only repeated actions. You can access this list with F3, and repeat your last action with Shift-R.
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Use the subtract blend mode to remove weight from vertex weights
To remove weight from vertex weights in Blender, you can use the "Subtract" blend mode. This blend mode allows you to subtract the specified weight from the vertex weights. The strength of your brush stroke determines the fraction of weight removed per stroke. However, it's important to note that the brush will not paint weight values below 0.0.
To use the "Subtract" blend mode effectively, follow these steps:
- Enter Edit Mode: Before making any changes, ensure that you are in Edit Mode. This allows you to make adjustments to the mesh and vertex weights.
- Select the Mesh Parts: Select the specific parts of the mesh where you need to change the weight. You can do this by pressing "C" and then using the paint select tool.
- Access the Data Panel: Look for the button with a triangle, which is the Data Panel, located in the Properties context under Vertex Groups.
- Adjust the Weight Slider: In the Data Panel, you will find a weight slider. Set this slider to 0 and then press "Assign" to remove the weight from the selected mesh parts.
- Specify Brush Settings: When using the "Subtract" blend mode, you can adjust the brush settings to control the weight removal process. This includes setting the brush strength, which determines how much weight is removed with each stroke.
- Paint with the Brush: Start painting on the desired vertices or mesh areas to remove weight. Remember that the strength of your brush stroke will impact the amount of weight removed.
- Monitor Weight Values: Keep an eye on the weight values as you paint. The "Subtract" blend mode will not allow painting weight values below 0.0, ensuring that you don't accidentally remove too much weight.
By following these steps and utilizing the "Subtract" blend mode, you can precisely remove weight from vertex weights in Blender. This allows you to fine-tune your 3D models and ensure that the weighting is exactly as you intend.
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Use the lighten blend mode to target specific weight values
When working with weight painting in Blender, it's important to understand the weight values and how they are visualised. Blender uses a colour system to represent weight values, with areas of low influence (weights close to 0.0) drawn in blue and areas of high influence (weights near 1.0) in red. The in-between values are represented by other colours of the rainbow.
To erase restraints in weight painting, you can use the Lighten blend mode to target specific weight values. This mode allows you to interpret the specified weight value as the target weight. Here's a step-by-step guide on how to use the Lighten blend mode effectively:
- Enter Edit Mode: Before making any changes, you need to enter Edit Mode. Here, you can select the specific parts of the mesh where you want to adjust the weight values.
- Select the Target Weight Value: In the Data Panel, which is the button with a triangle, you can set the target weight value. Under Vertex Groups in the Properties context, adjust the weight slider to your desired value.
- Understand the Lighten Blend Mode: In this mode, Blender interprets the specified weight value as the target weight. Only the weights below this target value will be affected, while weights above it will remain unchanged. This means that you can target specific weight values for adjustment without impacting the higher weight values.
- Paint with the Draw Brush: With the Lighten blend mode selected, you can now use the draw brush to paint over the areas you want to adjust. The brush will only affect the weights below your target value, allowing you to erase restraints or make targeted adjustments.
- Adjust Strength and Falloff: The strength of your brush will determine the fraction of weight removed per stroke. You can adjust the strength and brush falloff to control how much weight is erased with each brush stroke.
- Monitor Weight Values: Keep an eye on the weight values as you paint. Blender visualises these values using the colour system mentioned earlier. Ensure that you're only affecting the desired weights and not accidentally impacting higher weight values.
- Exit Weight Paint Mode: Once you're satisfied with your adjustments, remember to exit Weight Paint Mode. You can now observe the changes you've made and how they affect the overall model.
By following these steps and utilising the Lighten blend mode, you can effectively target specific weight values in Blender, allowing you to erase restraints and make precise adjustments to your weight painting.
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Use the blur blend mode to smooth out vertex weighting
To erase restraints in wedge paint in Blender, you can use the "Blur" blend mode to smooth out vertex weighting. This mode tries to smooth out the weighting of adjacent vertices, and the weight value is ignored. Instead, the strength of the blur tool defines how effectively it is applied. The strength determines how much of the weight is removed per stroke, but it will not paint weight values below 0.0.
To enter weight paint mode, use the hotkey Ctrl+Tab. The selected mesh object will be displayed with a rainbow colour spectrum, with blue representing unweighted vertices and red representing fully weighted vertices. In between these two extremes are a range of rainbow colours, depending on their value.
You can find predefined brush presets by clicking on the large brush icon at the top of the brush panel. Here, you can also make your own presets as needed. The most important and frequently modified properties include the weight (or colour) to be used by the brush, the amount of paint to be applied per brush stroke, and the radius of the brush's influence. You can change the brush radius with the keyboard shortcut "F" and then drag the mouse to increase or decrease the radius.
It is important to note that when using the smooth weights tool, you must be careful with the "Subset" option. Leaving it on "All" may cause the influence of a group to expand where it shouldn't, with a single blue vertex expanding to cover all selected vertices. One workaround is to use the Corrective Smooth modifier to smooth out the vertices after the fact.
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Frequently asked questions
You can enter edit mode, select the part(s) of the mesh where you need the weight changed (you can press C and also paint select) and in the Data panel in the Properties context under Vertex Groups, set the weight slider to 0 and press Assign.
You can use layers to isolate parts of your image that you want to erase and then use the "Erase Alpha" brush setting to erase without affecting the rest of the image.
There are a few blend modes that can be used to remove weight from weight painting: Subtract, which subtracts the specified weight from the vertex weights; Lighten, which only affects weights below the target weight; and Blur, which smooths out the weighting of adjacent vertices.
If you've only just made the mistake, you can use Ctrl-Z to undo your last actions, depending on the number of undo steps you have set under Edit > Preferences > System > Memory & Limits.
