Isabella Flores
When using Blender 3D software for weight painting, users may encounter challenges around joints and seek to lock joints during the process. Weight painting involves assigning weights to vertices or bones to determine the degree of deformation and influence on the mesh. Blender artists often face issues with weight distribution, especially around joints like knees, hips, elbows, and shoulders. To address these challenges, Blender offers features such as vertex groups, weight limits, and normalization tools. Additionally, understanding weight distribution in humanoid models, where joints typically carry heavier weights, can aid in creating more realistic deformations.
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What You'll Learn
Weight painting a humanoid
To begin weight painting a humanoid, select your mesh with the RMB and change to Weight Paint Mode. The mesh will be colored according to the weight or degree that the selected bone movement affects it. Initially, it will be all blue, indicating no effect. As you weight paint, the mesh around the bone should be red and fade out through the rainbow to blue for vertices farther away from the bone.
When weight painting a humanoid, joints typically have heavier weights where they are constantly stretching or compressing, such as under the arm, around the wrist, the back of the knee, and the knuckles. The weight distribution can be adjusted to achieve proper weights while conserving the total indicated number of particles. For example, a weight of 0.1 will result in 10% of the amount of particles.
Additionally, when working with an armature, you can select a deform group by selecting the corresponding bone. However, this vertex group selection mode is disabled when Selection Masking is active. You can also uncheck 'deform' in the bone properties for specific bones that you do not want to be part of the auto-weight calculations.
To create a realistic bend in the model, the head mesh should share influence with both the Head bone and the Upper Torso bone near the neckline. Once you have completed weight painting the humanoid, you can export your skinned model as an .fbx file using the Blender export settings for use in Studio.
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Weight painting a hand
Weight painting is a process that tells Blender how much each vertex is affected by a bone. For instance, when weight painting an upper arm, the vertices in the middle should ideally move in accordance with the upper arm bone, while the vertices on the elbow should be a 50/50 split between the upper and lower arm.
When weight painting a hand, the fingers should deform in a reasonable way. This can be challenging to achieve with a low poly mesh, and a subdivided mesh can help improve the results. Using a .05 weight brush to go through each vertex at the bone joints can also help achieve more realistic results.
It is important to note that you do not need to paint an area already affected by a child bone. For example, you do not need to paint the fingers if the finger bones are already painted and set as children. However, if you have 50% influence on weight from the arm on your hand, you may encounter issues with moving it properly.
Additionally, when automatically creating weight paint from bones, all bones are included in the calculation, which can result in certain bones "stealing" weight paint from others. This can be addressed by unchecking 'deform' in the bone properties for specific bones that you do not want to be part of the auto-weight calculations.
To create a more realistic hand weight painting, you can also consider using two different Armature modifiers: one with and one without the Preserve Volume option. This approach involves creating additional vertex groups, such as "no_mdef" for Mesh Deform modifiers and "face_def" and "hands_def" for Armature modifiers.
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Weight painting around joints
When it comes to weight painting around joints in Blender, there are several considerations and techniques to keep in mind. Firstly, it's important to understand the relationship between the mesh and the underlying bone structure. When in Weight Paint Mode, the mesh will be coloured according to the weight or degree to which the selected bone movement affects it. The mesh around the bone should typically be red, fading out to blue for vertices farther away from the bone.
To achieve smooth and realistic deformations around joints, such as the shoulders, it's crucial to consider the weights of the surrounding bones. For example, if the upper arm bone strength is significantly higher than the shoulder or torso bone strength, blending the values between them can help prevent deformations. Additionally, dividing the upper arm bone into two sections while ensuring they behave as one bone can improve the deformation issues.
Another technique to manage weight painting around joints is the "sock puppet" approach. This method involves merging overlapping meshes, removing unnecessary polygons, and creating a clean, single mesh to paint weights on. These weights can then be transferred back to the original meshes. This approach is particularly useful for dense or overlapping meshes, such as an arm inside a sleeve inside a jacket.
To speed up the weight painting process, you can paint over the default values to focus on the main areas first. This allows you to get the character to animation faster. Alternatively, you can start from the root joint and work through each section with more precision. Using the "Select Influence" option in the marking menu can help you isolate specific joints for weight painting.
When working with joints, it's helpful to name them in relation to the body. For example, using prefixes like "_Fng_" for fingers or "_Spine_" for spine joints can keep related joints together on the list and save time when searching for specific joints to paint. Additionally, naming joints in this way facilitates effective weight mirroring, which is important for symmetrical animations.
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Preventing bones from stealing weight paint
When automatically creating weight paint from bones in Blender, all bones are included in the calculation. This can result in some bones “stealing” weight paint from others, leading to undesirable deformations in the mesh. To prevent this, you can manually adjust the weight paint distribution by following these steps:
Unchecking "Deform" in Bone Properties
In the Properties window, navigate to the Bone Data tab. Here, you can uncheck the "Deform" option for specific bones that you do not want to be included in the automatic weight calculations. This will exclude those bones from the calculation, ensuring that they do not "steal" weight paint from other bones.
Locking Vertex Groups
Another method to prevent bones from "stealing" weight paint is by locking vertex groups. In the Properties window, go to the Mesh Data tab and click on the lock symbol to the right of the vertex group list. This will lock the selected vertex group, causing it to be ignored in operations or calculations involving that particular vertex group or bone. Alternatively, you can access the locking options by clicking on the drop-down menu (denoted by [v]) next to the vertex group list.
Using Helper Tools
Blender provides a set of helper tools for weight painting, including the Smooth operator. This tool blends the weights of selected vertices based on the average of adjacent vertices, creating smoother transitions in weight painting. This can help eliminate abrupt transitions between vertex weights, refining the weight distribution and improving deformation in rigging.
Additionally, the Mirror Vertex Group tool can be used to create mirrored weight groups for symmetric characters. By deleting the target vertex group and creating a copy of the source bone vertex group, you can then rename the new group and use the Mirror tool to replace each weight by its opposite value.
By utilizing these methods, you can have more control over the weight paint distribution in Blender, preventing bones from "stealing" weight paint and achieving the desired deformations in your mesh.
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Using vertex groups
When using Blender for weight painting, vertex groups can be extremely useful. Vertex groups allow you to paint weights onto specific vertices of a mesh, controlling how the mesh is affected by bone movements. To begin, select your mesh with RMB and switch to Weight Paint Mode. The mesh will be coloured according to the weight, or degree to which the selected bone movement impacts it.
You can then start weight painting. The mesh around the bone should typically be red and gradually fade to blue for vertices farther away, indicating a lower weight value. If you paint on vertices outside the group, they will automatically be added to the vertex group. For a symmetrical mesh and armature, the X Mirror option can be used to create mirrored groups with symmetrical weights.
Additionally, when working with deform bones, selecting a corresponding bone will allow you to choose a deform group. However, this feature is unavailable when Selection Masking is active. It's important to note that vertices with zero weight will generate no particles, while a weight of 0.1 will result in 10% of the particles.
Vertex groups can also be utilised to create varying levels of hairiness on your mesh. By weight painting a vertex group and specifying its name in the Vertex Groups panel (Properties editor ‣ Particles tab), you can make certain portions of your mesh hairier than others. Furthermore, you have the option to "lock" vertex groups, providing additional control over the weight painting process.
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Frequently asked questions
Yes, you can lock joints in Blender when weight painting. This can be done by unchecking '[] deform' in the bone properties (properties window > bone data tab) for specific bones that you do not want to be part of the auto-weight calculations.
This can be due to the vertices being connected to multiple parts of the mesh. To resolve this, you can rip the vertices by clicking on 'Display modifier in edit mode' and 'adjust edit cage to modifier result' in the modifier panel.
You can select "limit total" in the "weights" tab menu while in paint weight mode. Alternatively, you can use the "normalize all" operation, which normalizes your weights around locked vertex groups.
When weight painting a humanoid, you will usually have a heavier weight at the joints where they are constantly stretching/compressing (under the arm, around the base of the wrist, back of the knee, knuckles, etc.) and lighter in-between.
