Isabella Flores
Weight painting in Maya can be a tricky and frustrating process, but there are several tips that can help streamline the process and avoid common pitfalls. Firstly, it is recommended to start with a rough block-out for major sections like the upper and lower torso, painting everything with an influence of 1 to the bone that makes the most sense, following the joint hierarchy. It is generally better to add to weights than to subtract, as subtracting weights from a bone can cause floating weights by adding them to another bone that Maya may not accurately identify. Helper joints are also important to ensure proper rotation, and it is crucial to lock down joints that don't need to be changed. While it is a challenging process, weight painting in Maya becomes easier with practice, and users can benefit from familiarizing themselves with the software's tools and tutorials.
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What You'll Learn
Avoid manual painting; use edge loops and flood vertices
When weight painting in Maya, it is advisable to avoid manual painting. Instead, you can use edge loops and flood vertices to achieve better results. Here are some detailed steps and tips to help you with this process:
Firstly, it is recommended to skin everything to a single bone, typically the pelvis, but this can vary. Then, assign an influence of 1 to the relevant bone, following the joint hierarchy. For example, start with the pelvis, then move to the spine, arms, and finally, the fingers. This will ensure that the weights of the parent joint "bleed over" to the child joint.
Next, instead of manually painting with a brush, select edge loops and flood the vertices with a weight of 1 for the underlying joints. This will help you avoid the tedious task of painting over everything manually. After this step, you can smooth out the transitions or use ngskintools relax on the edge loops around transition areas.
To further refine your weight painting, consider adding a small influence of around 20% on rows opposite to the bend. For example, when working on an elbow, weight it normally, and then give the highest row of the elbow influence a 20% influence from the shoulder. This technique provides more controlled smoothing.
Additionally, when binding the skin to your joints, it is suggested to turn off "maintain maximum influence." This will allow you to paint weights off one joint and have it appear on another, providing more flexibility in your work.
Remember that weight painting is both an art and a science, and practice is key. Don't be discouraged if you don't master it immediately. With time and experimentation, you will develop your own techniques and find what works best for your specific projects in Maya.
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Add to weights rather than subtracting
When weight painting in Maya, it is generally better to add to your weights than to subtract. This is because subtracting weight from a bone automatically adds it to another bone, and Maya might not always redistribute the weight to the correct bone, resulting in \"floating\" weights.
To avoid this issue, you can start by flooding the mesh white at the root joint and then moving down the chain, adding weight to each consecutive joint. While this method may be more time-consuming, it is a cleaner approach. You can also select and "flood" verts on the model with a colour, which can make the process easier.
Another tip is to lock down the joints you do not want to change. For example, if you are painting the chest, you can lock the leg joints. This prevents Maya from redistributing weight to random bones.
Additionally, it is recommended to only remove influence from one area if you have everything else locked except for the joint you want it to go to. This gives you more control over where the influence is added.
By following these suggestions and adding to weights instead of subtracting, you can achieve more precise and predictable results when weight painting in Maya.
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Begin with a rigid skinning style
When weight painting in Maya, it is recommended to begin with a rigid skinning style. This means making everything rigid (set to 1.0 in the component editor) first and then doing a second pass to blend weights where needed.
To start, skin everything to one bone (usually the pelvis). Then, paint everything with an influence of 1 to the bone that makes the most sense, following the joint hierarchy (e.g., pelvis > spine > arms > fingers). This will ensure that the weights of the parent joint "bleed over" the child joint.
It is important to avoid manually painting via a brush. Instead, select edge loops and flood vertices weights to 1 for underlying joints. After that, smooth out transitions or use ngskintools relax on edge loops around transition areas.
Make sure that the weight adds up to 100 over multiple joints. When in doubt, check the deformer spreadsheet, or manually add up the weight of a joint by doing a vertex select.
By beginning with a rigid skinning style, you can quickly move through the hierarchy and smooth out areas as needed, allowing for more control and precision in your weight painting process.
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Ensure the weight adds up to 100 over multiple joints
When weight painting in Maya, it's important to ensure that the weights add up to 100% over multiple joints. This is because every vertex has to add up to 100% influence, even if it is distributed across multiple joints. To achieve this, you can follow these steps:
Firstly, when in doubt, check the deformer spreadsheet. You can also perform a vertex selection and manually add up the weight of each joint to ensure they sum to 100%. When painting weights, always try to "Add" skin weight values instead of using smooth painting. This will help you control the distribution of weights across multiple joints.
Secondly, lock the skin weights on all but the neighbouring two or three joints while painting skin weights. This prevents unwanted skin weight values from being assigned to joints further away in the joint hierarchy. You can also choose to lock the number of participating joints during Smooth Skin to prevent Maya from adding weights to more joints while you are painting them.
Thirdly, when working from leaf to root, unhold a leaf and its parent, and then block (paint weights at 100%) in the region the leaf should influence. Repeat this process for all joints. This ensures that each joint has a solid 100% band of influence before moving on to the next one.
Finally, if you encounter visual glitches or issues with locked joints, try manually cleaning up the edges with fill and subtraction brushes, always with a specific neighbouring joint active to receive the influence. Alternatively, you can start with every joint unlocked and then flood 100% of the weight to the base spine before proceeding with the rest of the joints.
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Use helper joints for the arms and legs
Helper joints are necessary in some places like the arms and legs. This is because Maya joints cannot replicate the way muscles work in real life. While they are okay in areas that are basically hinge joints, like the elbow, they can't handle complicated areas like the shoulders. Helper joints can be used to ameliorate some of these problems, but a muscle sim is the only way to achieve real deformation.
In Maya, joints are just a point in space, and the verts that are weighted to that joint rotate around it. This is quite different from how our bodies move in real life, so helper joints are needed to fake certain movements. For example, the arm with helper joints will twist in a left-to-right motion, whereas the arm without helper joints will have a broken topology in the lower arm.
Helper joints are usually roll bones placed in areas where Maya's simple joints can't move correctly. For instance, there is a roll bone in the forearm to capture the movement of the ulna and radius bones. Similar joints can be found in the bicep and thigh areas.
When painting weights, it is recommended to first flood one joint with all the influence of the model, preferably the hip joint. Then, go over body parts one by one with full influence, starting with the upper leg, then the lower leg, foot, toes, and so on. Once this is done, go down to half influence and smooth between those body parts, then lower a bit more and smooth some more. This method can make the process more manageable.
It is also important to note that helper joints are not always the solution. Sometimes, you may need to add more joints, but this may not be practical in terms of rigging or animation. In such cases, you might need to consider other approaches, such as using a muscle system or soft-tissue simulations.
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Frequently asked questions
First, skin everything to one bone (usually the pelvis). Then, paint everything with an influence of 1 to the bone that makes the most sense, in the order of the joint hierarchy (pelvis > spine > arms > fingers). Once you're done, use NGSkinTool's relax function to smooth out the skin.
It's generally better to add to your weights than to subtract. Subtracting weights from a bone can cause "floating" weights as Maya might add them to the wrong bone. It's also important to lock down the joints you don't want to change and only add influence to specific joints as needed.
Weight painting can be a time-consuming and challenging process, but it gets easier with practice. It's recommended to do a rough block-out for major sections (upper torso, lower torso, etc.), test it out, and then refine the details. Additionally, using helper joints and corrective blend shapes can improve the accuracy of your weight painting.
