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  • 对于具有相同骨骼结构的不同骨架，如何使用同一套动画

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ECG_Kinsey Hmmm, as far as I have tried on my end, changing the bone scale in the transform constraint does not produce that result. I've attached a updated Spine project with the results of my own testing (in skin B I scale the arm bones via the transform constraint UpperArm_Position_B):

skinconstraintswithbonescale.zip
35kB

Perhaps the quickest way to confirm your problem is to see your Spine project in person. A minimal Spine project with irrelevant parts removed would be fine, so could you email it to us?: contact@esotericsoftware.com

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      Bone and attachment (Images) compensation affects manipulating bones in the viewport. It does not affect applying constraints. It is not applied when adjusting a transform constraint.

      You are fine up to this step:

      If I understand, you parent the slot to the root bone, apply the transform constraint, then parent the slot back. That puts the arm in the right position, but in your original skin the arm moves. Is the arm that moves in the same slot? If so, then you can't use parenting the slot to the root to move your attachment. Instead, parent only the attachments in the second skin to the root bone in a new slot, apply the transform constraint, then parent them back and delete the temporary slots on the root bone.

      As a simpler test, instead of changing the parent of attachments in the tree, just manually move the attachments to be in the right place in the viewport. Each attachment has its own position. Moving one doesn't affect other attachments in the slot or in other skins. (Except for linked meshes, which share the vertex positions.)

      For your IK scaling problem, you probably need to set the transform constraint to local and possibly relative. In general it's not possible to tell what is going on from an image or GIF. If you can send a .spine file it would be easier to provide guidance.

        Misaki 已经准备了一个工程通过邮件发至对应邮箱，可以复现这个问题，我的Spine版本是4.1.24

          Nate

          test.zip
          126kB

          这是我模拟的工程，删除了无关的骨骼，可以复现这个问题

            • Nate

            • Postagem nº22
            • Editado
            • Post em inglês

            Thank you for the simplified project. The first thing we will do is delete everything that doesn't affect the problem, so I appreciate that you have done that.

            The problem is here, the constraint [FIX]F-arm:
             Loading Image

            When scale X and scale Y are different values, it is called non-uniform scale. This constraint applies non-uniform scale to bone F-arm. The bone F-wrist is a child so it inherits scale from its parent. That scale from the parent is applied in the direction of the parent. When F-wrist points in the same direction as the parent, F-wrist is scaled shorter. When F-wrist is rotated 90 degrees from the parent, it is no longer shorter, it is instead made wider. As your IK target is moved, F-wrist is rotated and the scale from the parent changes its length.

            To fix it, use uniform scale, where scale X and scale Y have the same values:
             Loading Image
            With this, no matter what rotation F-wrist has, it will always be the same length.

            You probably want to use uniform scale in other areas. I also suggest turning off transform constraint mixes you don't need, eg rotation and shear.

            I forgot to mention, my earlier project was saved with 4.2, so it won't open in 4.1. It's probably not useful now anyway.

              Nate 就是这个导致的，我这边按照你的指点调整了以后也顺利解决了，非常感谢你和Misaki的耐心讲解，我学习到很多，感谢有你们的帮助！

                Sure, we're glad to help!

                It is a little unfortunate to need to disable inherit scale to change bone lengths for skins, and to have to introduce intermediary bones for attachments. We'll consider other ways to change the bone length. For it to be in the skin, it'd need to be a constraint.

                  Nate 期待未来有这么个功能，这样子的话会方便很多。

                  请教个问题，之前您提及到建议关闭不需要的变换约束混合，哪怕我当前开启的变换约束混合没有发生作用，这也会有额外开销或者其他影响吗

                  如下图所示

                    Nate 之前提及的问题一切都解决的很顺利，等我们绑定完骨骼开始预览动画的时候，出现了新的问题。
                    我们发现通过变换约束缩放的骨骼在父节点旋转的时候，无法保持固定的相对位置，会随着旋转产生偏移量。
                    请关注下面图中肩膀的位置

                    这是通过普通的骨骼绑定产生的效果，也是我们期望得到的效果。

                    这是通过变换约束调整不同尺寸骨架绑定的效果，这种方式在旋转的过程中，产生了异常。

                    testrotate.zip
                    94kB

                    我们准备了一个工程文件，可以复现这个问题。在这个工程中，有两个骨架，分别命名为“Wrong”和“Correct”，他们一个表现正常，一个表现出了我上面所述的问题。

                    我们已经做了很多检查，不知道我们做错了什么，希望能得到帮助

                      You mentioned before that it is recommended to turn off unnecessary transformation constraint blending. Even if the transformation constraint blending I currently enable does not take effect, will there be any additional overhead or other effects?

                      Yes, the transform constraint does extra work for rotation and shearY. Set the mixes to 0 for transform properties you don't need to affect.

                      Thank you for the reproduction Spine project. The behavior occurs because you are using the transform constraint in the world coordinate system. When doing that "up" is always toward the top of your monitor. When the bones rotate, moving the bones toward the top of your monitor becomes the wrong direction.

                      To fix it, check Local. This moves the bones in their local coordinate system, where "up" is in relation to the parent bone. That way when everything rotates, the up direction also rotates, and the shoulder stays in the correct place in relation to the other bones and attachments.

                      After changing to Local you likely need to reposition your bones.