Priya Kapoor
Unreal Engine's Mesh Paint mode allows users to paint directly on a mesh's vertices and textures within the viewport. It provides a quick way to adjust colour and texture on mesh materials. There are four mesh painting methods to choose from, each with its own tools and settings. Users can paint multiple instances of a single mesh with unique colours and alpha values, and visualise colour data directly. Most painting features are intuitive and require little to no setup. The Mesh Paint Tool is brush-based and includes settings to control how painting colours on meshes work.
| Characteristics | Values |
|---|---|
| Purpose | To interactively paint vertex colours on meshes in the Editor Viewport |
| Mesh Paint Panel | Includes a selection of mesh painting methods, tools and settings |
| Mesh Painting Methods | Vertex Colour Painting, Vertex Weight Painting, Texture Weight Painting |
| Requirements | Texture Colour painting requires Virtual Textures to be enabled for the project |
| Per-instance vertex colour data cannot be visualised for any Nanite-enabled mesh | |
| Mesh being painted on must have a material assigned that is set up to blend textures for different layers | |
| Mesh's Material must contain a Vertex Colour node | |
| Tools | Settings to control how painting colours on meshes works |
| Brush settings | |
| View modes |
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What You'll Learn
Activating Mesh Paint Mode
Mesh Paint is a tool in Unreal Engine that allows users to interactively paint vertex colours on meshes in the Editor Viewport. Mesh Paint mode provides a quick way to adjust colours and textures on meshes.
To activate Mesh Paint mode, open the level editor and select a painting method from the Paint Method tab. Choose the mesh you want to paint and select the Paint tool. You can then start applying paint to the selected mesh. It's important to note that certain features may be disabled while Mesh Paint mode is active, such as translating and scaling. However, you can still perform common actions like camera movement and selecting level actors.
Before using certain features of Mesh Paint mode, there are additional requirements to be met. For instance, Texture Colour painting requires Virtual Textures to be enabled for the project. You can enable this by going to the project settings under the Engine-Rendering section. Similarly, for Vertex Colour painting with Nanite-enabled meshes, Nanite should be temporarily disabled to view and paint per-instance vertex colour data.
There are four mesh painting methods to choose from, each with its own toolbar and set of tools. These methods include Vertex Colour, Texture Colour, and Textures, which share similar properties for painting and erasing colours. The method for Vertex Weights allows for setting how texture painting blends between target layers.
The Mesh Paint panel provides a selection of mesh painting methods and tools to interactively paint within the level viewport. It offers various settings to control how painting colours on meshes work, with some settings exclusive to specific mesh painting methods.
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Painting on individual mesh instances
To begin, activate Mesh Paint mode in the level viewport by selecting it from the Modes dropdown menu in the main toolbar. This will open the Mesh Paint panel to the left of the viewport, providing access to various mesh painting methods and their respective tools and settings.
When using vertex colours or texture colours, you are painting on individual instances of the mesh rather than the mesh asset itself. This means that you can paint multiple instances of a single mesh with unique colours and alpha values, customising each instance to your desired material. The colour data stored on one instance can be copied and pasted to another instance using the Vertex Colour and Texture Colour tabs, allowing for efficient colour application across multiple meshes.
The Mesh Paint panel offers several mesh painting methods, including Vertex Colour, Texture Colour, Textures, and Vertex Weights. These methods provide options for painting, erasing, and specifying colour channels, as well as blending textures for different layers. For instance, when painting texture weights, ensure that the mesh has a material assigned that supports texture blending for distinct layers. This enables you to paint and erase each layer, revealing different parts of the texture on the mesh.
The Mesh Paint tool also includes visualisation options, such as the Colour View Mode, which allows you to visualise how colours are applied to the mesh within the level viewport. You can choose to view RGB, Alpha, or individual colour channels to fine-tune the appearance of your painted mesh instances.
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Painting Blend Weight values for multi-texture setups
Firstly, ensure that you have activated the Mesh Paint mode in the level viewport. This mode provides a set of tools for painting directly on a mesh's vertices and textures. You can find it in the Modes dropdown selection in the main toolbar of the level viewport. Once activated, the Mesh Paint panel will open, giving you access to various mesh painting methods and settings.
To paint Blend Weight values for multi-texture setups, you need to set up a Texture Blended Material for the mesh. This involves choosing a Texture Weight Type that matches the number of textures you want to blend. For example, if you're blending between two textures, select the appropriate Texture Weight Type option.
Next, use the Paint Texture Weight Index tool to paint on a specific layer. This tool is found under the Brush category in the Mesh Paint tool. You can also use the Erase Texture Weight Index tool to erase parts of the texture and reveal underlying layers.
When painting texture weights, the mesh must have a material assigned that is set up to blend textures for different layers. This means that each layer can be painted or erased to reveal different parts of the texture on the mesh. For instance, you can create the effect of a water puddle on a dirt path material by blending between two textures.
The Mesh Paint tool allows you to visualise how colour is being applied to the mesh within the level viewport. You can choose to view RGB, Alpha, or individual colour channels to better understand how your texture blending is working.
By following these steps, you can paint Blend Weight values for multi-texture setups in Unreal Engine, creating interesting and varied textures on your meshes.
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Painting vertex colours
To visualise vertex colours outside of the tool, you can go to the Viewport toolbar and click Show > Advance > Vertex Colours. However, this visualisation feature does not work on Nanite-enabled meshes.
The Paint Vertex Colours tool can be used for various workflows, such as editing imported vertex colours, creating textures using the Vertex Colour node, and making masks. The tool consists of Quick Actions and Utility sections to streamline the vertex painting process. Once you're done, you can accept or cancel your changes in the Tool Confirmation panel.
To perform instance vertex painting, where vertex colours are stored on the component in the level, you can use Mesh Paint Mode. While Mesh Paint Mode does not provide instance vertex colour data, you can establish unique vertex colours for an asset through the Skeleton Editor or the Deform category in Modeling Mode.
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Painting textures
To start painting textures, you must first activate Mesh Paint mode. In the level viewport, use the Modes dropdown selection in the main toolbar to choose Mesh Paint. Once activated, the Mesh Paint panel will open to the left of the viewport, providing access to various mesh painting methods and their respective tools and settings.
The Texture Colour mesh paint method is specifically used for painting textures. This method creates a Mesh Paint Texture asset for each instance of the mesh being painted on. These mesh paint textures are always virtual textures and can be found under the Engine-Rendering category in the project settings.
Before using the Texture Colour painting feature, ensure that Virtual Textures are enabled for your project. This can be done by enabling the "Enable virtual texture support" setting under the Engine-Rendering section.
When painting texture weights, it is important to assign a material to the mesh that is set up to blend textures for different layers. This allows you to paint and erase each layer to reveal parts of the texture on the mesh. For example, you can simulate painting a water puddle on a dirt path material.
The Mesh Paint tool provides a brush-based system for painting textures, with settings found under the Paint tool for the selected mesh paint method. You can visualise how colour is being applied to the mesh within the level viewport using the Colour View Mode in the Visualization category. This allows you to view RGB, Alpha, or individual colour channels to fine-tune the texture painting process.
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Frequently asked questions
In the main toolbar of the level viewport, use the Modes dropdown selection to select Mesh Paint. Once activated, the Mesh Paint panel opens to the left of the viewport.
The Mesh Paint Tool has three different painting modes: Vertex Color Painting, Vertex Weight Painting, and Texture Weight Painting.
Vertex Color Painting paints color data directly onto a mesh's vertices.
Texture Weight Painting allows you to paint on textures.
This can be done by copying color data from one instance and pasting it to another.
