锻造Autodesk模型的变换矩阵
[英]Forge Autodesk model's transform matrix
问题描述
I would like to know what are the two matrix below and what they are used for : 
我想知道下面的两个矩阵是什么，它们分别用于什么：
- placementTransform (1 x 12) placementTransform（1 x 12）
- refPointTransform (1 x 16) refPointTransform（1 x 16）
Does anyone know what they are used ? 有人知道他们使用了什么吗？ I think it has to do with translation(Tx, Ty, Tz)/rotation (Rx, Ry, Rz) of 3D objects but there are too many parameters in each vector... 我认为这与3D对象的平移（Tx，Ty，Tz）/旋转（Rx，Ry，Rz）有关，但是每个向量中的参数太多...
1 个解决方案
解决方案1
1 已采纳 2018-04-04 17:52:10
The placementTransform sets the position-offset and scale of a model during loading. PlacementTransform设置加载期间模型的位置偏移和比例。 refPointTransform is similar (but contains rotation), but is applied (multiplied) after the placementTransform. refPointTransform相似（但包含旋转），但在placementTransform之后应用（相乘）。
Here is an example and source code, of how to use 'placementTransform': https://github.com/wallabyway/viewer-multimodel-search/blob/1c2e71397a78ab807644f96dfb34b8e578825987/docs/index.html#L61 以下是有关如何使用“ placementTransform”的示例和源代码： https : //github.com/wallabyway/viewer-multimodel-search/blob/1c2e71397a78ab807644f96dfb34b8e578825987/docs/index.html#L61
Take a look at line 61. When I load in the second model, I set the offset and scale of the 3D-building, so that it's positioned above the 3D-hand-saw. 看一下第61行。在第二个模型中加载时，我设置了3D建筑的偏移量和比例，以使其位于3D手工锯上方。
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