Thanks for your time on this, I do appreciate it.
Robert Osfield wrote:
From the sounds of it your have uncovered two unrelated bugs in
Optimizer and it'd be appropriate to fix both. With a quick read
through your email I can't pinpoint what code is amiss and what to
I agree, probably two issues.
mix. Would it be possible to create a non proprietary dataset that
reproduces this problem?
Yes, I got it down to a small non-proprietary example. The attached
scene graph renders a 4-vertex tri strip. The Geometry is parented to a
static MatrixTransform that is instanced twice. The result: two tri
strips should be rendered.
To see correct behavior, try this:
export OSG_OPTIMIZER=OFF
osgviewer test.osg
and bring up stats, you'll see 1 Drawable instanced twice, and 4
vertices for a total of 8 instanced vertices. This is all correct behavior.
To reproduce just the FLATTEN_STATIC_TRANSFORMS issue, try this.
export OSG_OPTIMIZER=FLATTEN_STATIC_TRANSFORMS
osgviewer test.osg
Again, bring up stats and see that the number of instanced Drawables and
vertices has doubled. Close examination of a converted file will show
that the Drawable has been added as a child twice to the same parent.
This should be fixed, but I haven't tracked it down root cause yet.
Finally, to reproduce the MERGE_GEODES crash, try this:
export OSG_OPTIMIZER=FLATTEN_STATIC_TRANSFORMS|MERGE_GEODES
osgviewer test.osg
mergeGeodes() crashes when it encounters the same Geode added as a child
twice to the same parent. This is a separate issue from the FST issue
and should have its own fix, for robustness' sake.
I'll keep digging on FLATTEN_STATIC_TRANSFORMS to see if I can identify
the code that is going awry.
Thanks again,
-Paul
Group {
nodeMask 0xffffffff
cullingActive TRUE
num_children 2
MatrixTransform {
DataVariance STATIC
nodeMask 0xffffffff
cullingActive TRUE
referenceFrame RELATIVE
Matrix {
10 0 0 0
0 10 0 0
0 0 10 0
-3.73685 0 0.52 1
}
num_children 1
MatrixTransform {
UniqueID MatrixTransform_30
DataVariance STATIC
nodeMask 0xffffffff
cullingActive TRUE
referenceFrame RELATIVE
Matrix {
0.1 0 0 0
0 0.1 0 0
0 0 0.1 0
0 0 0 1
}
num_children 1
Geode {
name "body #2"
nodeMask 0xffffffff
cullingActive TRUE
num_drawables 1
Geometry {
DataVariance STATIC
useDisplayList TRUE
useVertexBufferObjects FALSE
PrimitiveSets 1
{
DrawElementsUShort TRIANGLE_STRIP 4
{
0 1 2 3
}
}
VertexArray Vec3Array 4
{
0 0 0
1 0 0
0 0 1
1 0 1
}
ColorBinding OVERALL
ColorArray Vec4Array 1
{
1 1 1 1
}
}
}
}
}
Use MatrixTransform_30
}
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