Node Hierarchy - concatenating matrices

Other Standards COLLADA
1

Hi all,

we’re trying to load a node hierarchy, but we don’t know how to combine the different transformations (translation - rotation - scale) in COLLADA standard. Does anyone have already succeeded with this ?

Here is a very simple example. There is one node with a single child node.

Thank you,

Barbara

  
<node id="Box03p-node" name="Box03p" type="NODE">
        <translate>35.066 7.13668 13.2857</translate>
        <rotate>1 0 0 -15.0428</rotate>
        <scale>1 1 2.93654</scale>
        <node id="Box03p-node_PIVOT" name="Box03p_PIVOT" type="NODE">
          <translate>-2.17809 -3.44394 -5</translate>
          <instance_geometry url="#Box01p-mesh">
            <bind_material>
              <technique_common>
                <instance_material symbol="AAvar_Tmod" target="#AAvar_Tmod">
                  <bind_vertex_input semantic="CHANNEL1" input_semantic="TEXCOORD" input_set="1"/>
                </instance_material>
              </technique_common>
            </bind_material>
          </instance_geometry>
        </node>
      </node>
2

Convert each transform to a matrix and post-multiply. For the first node in your example, convert the translate, rotate, and scale to transform matrices T, R, and S, and the node’s local transform is then TRS.

3

Thank you, it’s working now :smiley:

Barbara