Uncorrect value return by getPos on a node inside an egg

[zozizozu]

Hi all.
I have a model that contain 2 groups, tagged “room” and “door”, but when access to node.getPos(render), value is not correct.

nodes=self.environment.findAllMatches("**/=myTag=door")
for item in nodes:
  print item.node.getPos(render)

I have strange matrix into my egg, is it possible that it’s modifie the absolute position of a node.
If it’s the case, how can i solve this according that i did not really understand what matrix was ( it’s difficult for me to understand english ).

Here is a piece of my egg

<Group> Scene_Root {
  <Group> door3dad {
    <Transform> {
      <Matrix4> {
        0 0 -1 0
        0 2.25 0 0
        0.1 0 0 0
        6 0.15 -5 1
      }
    }
    <Group> door3 {
	<Tag> myTag {door}
      <VertexPool> apertureObj3 {
        <Vertex> 0 {
          5.95 0.024999 -5.5
          <Normal> { -1 0 0 }
        }

Thank for your time
Regards

[drwr]

In general, transforms that appear in an egg file are flattened automatically when the egg file is loaded. This is done because very often there is a cost to having transforms in the scene, and usually transforms that appear in an egg file are there unintentionally.

This means that when you find a sub-model within an egg file and call getPos() relative to the root of the model, you get the answer (0, 0, 0).

If what you wanted was the accumulation of the transforms instead, you should add the tag:

<DCS> { 1 }

within any entry that also contains a entry. This will prevent the transforms from being flattened out. Depending on your modeling package and conversion tool, you may be able to do this automatically at the time of conversion.

David

[zozizozu]

Yes, thank you very much, that’s working perfectly.
Just tell me please, how do you know about this tag. I’ve seach but all i found is { boolean-value } and { dcs-type }, but did not found explanation about what dcs and dcs-type was.

Thanks again

z

[rdb]

I believe DCS stands for Dynamic Coordinate System.

From the .egg documentation (panda/src/doc/eggSyntax.txt in the source):

@eggSyntax.txt

{ boolean-value }

DCS stands for Dynamic Coordinate System.  This indicates that
show code will expect to be able to read the transform set on this
node at run time, and may need to modify the transform further.
This is a special case of <Model>, below.

{ dcs-type }

This is another syntax for the <DCS> flag.  The dcs-type string
should be one of either "local" or "net", which specifies the kind
of preserve_transform flag that will be set on the corresponding
ModelNode.  If the string is "local", it indicates that the local
transform on this node (as well as the net transform) will not be
affected by any flattening operation and will be preserved through
the entire model loading process.  If the string is "net", then
only the net transform will be preserved; the local transform may
be adjusted in the event of a flatten operation.

[zozizozu]

Well, i can not find this panda/src/ directory, but i will .

Thanks again