Hi,
On Wed, 2014-06-04 at 10:57 +0200, Marcel Weiler wrote:
> Hi all,
>
> for instanced rendering I want to give the instanced Geometry core an
> attribute that represents a per-instance position offset. I know how to
> set the usual indices and positions, but how do I add custom vertex
> attributes?
> I tried setting the property to binding location 1 using Snippet
> geo->setProperty(offsets, 1) but this causes the following warning:
> Snippet
> WARNING: GeoVectorProperty::activate: Non-Generic attribute nr. 1 unknown!
>
> and this approach does not work (the instances are not rendered with an
> offset).
>
> I also tried misusing the colors property, but even though I set its
> divisor to 1 it seemed to be advancing per vertex, not per instance.
>
> Am I even on the right track here?
yes, this should work.
> Or do I have to set some properties in the GeoInstancer?
no, just the base geometry and the number of instances.
e.g. from the CSM example
core GeoInstancer
{
numInstances 4
baseGeometry USE BaseGeometry
}
first quick one (and sorry if you have), have you looked at/tried
Examples/CSM/Instancing/SimpleDivisor ?
If yes, there is something weird going on with the example. Using
vec4 vVertex = gl_Vertex + vec4(
gl_MultiTexCoord7);
results in wrongly scaled/projected instances. This can be fixed by
changing the vertex position computation to
vec4 vVertex = gl_Vertex + vec4(
gl_MultiTexCoord7.xwz, 0.);
The example uses attribut 15, but I quickly tried 1 and 3 and it works
as expected.
If you can, could also send me a .osg dump of the subgraph containing
the instancing (off-list is fine) and I can have a further look.
kind regards
gerrit
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