Emiliano/210 #852
Emiliano/210 #852
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…escription.It loooks like the animation example is old (glTF1.0) I am leaving it as is to avoid conflicts
specification/2.0/README.md
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| #### Morph Targets | ||
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| Morph Targets are defined by extending the Mesh concept. | ||
| A Morph Target is a morphable Mesh where primitives' attributes are obtained by adding the original attributes to a weighted sum of targets attributes (this operation corresponds to COLLADA's `RELATIVE` blending method). |
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It would be better to show equation than use external COLLADA reference.
specification/2.0/README.md
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| Morph Targets are defined by extending the Mesh concept. | ||
| A Morph Target is a morphable Mesh where primitives' attributes are obtained by adding the original attributes to a weighted sum of targets attributes (this operation corresponds to COLLADA's `RELATIVE` blending method). | ||
| Morph Targets are implemented via the `targets` property defined in the Mesh `primitives`. Each target in the `targets` array is a dictionary mapping a primitive attribute to a Morph Target displacement, currently only two attributes ('POSITION' and 'NORMAL') are supported. All primitives are required to list the same number of `targets` in the same order. |
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Each target ... mapping a primitive attribute to a Morph Target displacement
... mapping a primitive attribute to an accessor containing Morph Target displacement data
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| } | ||
| ], | ||
| "weights": [0, 0.5] |
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It's still not quite obvious to me, why do we have two ways of defining initial morph state: mesh.weights and node.weights. Just asking.
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mesh.weights are the Morph Targets default weights.
node.weights are the instantiated Morph Targets weights (that override the weights of the mesh).
Say that you have a Morph Target, it is a character face. You want to instantiate it multiple times in your scene, and you want to instantiate it as a smiling face. Then just set the default mesh.weights accordingly (make it smile!) and don't set the instantiation weights node.weights when you instantiate it within a node.
Makes sense?
| @@ -31,6 +31,14 @@ | |||
| "default" : 4, | |||
| "gltf_detailedDescription" : "The type of primitives to render. All valid values correspond to WebGL enums." | |||
| }, | |||
| "targets" : { | |||
| "type" : "array", | |||
| "description" : "An array of Morph Targets, each Morph Target is a dictionary mapping attributes (only "POSITION" and "NORMAL" supported) to their deviations in the Morph Target.", | |||
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Double-quotes must be escaped here.
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@lexaknyazev I addressed your concerns, back to you. Thanks |
Implementing Morph Targets as discussed in #210.
@lexaknyazev all yours!