Vray Procedural

[Phillip]

Hi There,

I have been trying to figure out how to access information about objects containing procedurals.

I am able to find the name of the object with:

pObjHandle = VRAY_PointCluster::queryObject(pObjName);

objName = VRAY_PointCluster::queryObjectName(pObjHandle);

objRootName = VRAY_PointCluster::queryRootName();

Geometry samples work as well:

int geoSamples = queryGeometrySamples(pObjHandle);

cout << "\nGEO SAMPLES:" << geoSamples;

However when I go to do something like this mantra crashes:

pObj_geo = queryGeometry(pObjHandle, geoSamples);

cout << "\nNUM POINTS:" << pObj_geo->points().entries();

Are there any examples out there about how to access information about geometry

in a scene? I am looking to get at anything that a gdp would provide a sop.

It says that Mantra uses a subclass of the GU_Detail so I have a feeling that not all

the same info is available...?

Any help would be great ...

Thanks,

Phillip

[crunch]

Hi There,

I have been trying to figure out how to access information about objects containing procedurals.

I am able to find the name of the object with:

pObjHandle = VRAY_PointCluster::queryObject(pObjName);

objName = VRAY_PointCluster::queryObjectName(pObjHandle);

objRootName = VRAY_PointCluster::queryRootName();

Geometry samples work as well:

int geoSamples = queryGeometrySamples(pObjHandle);

cout << "\nGEO SAMPLES:" << geoSamples;

However when I go to do something like this mantra crashes:

pObj_geo = queryGeometry(pObjHandle, geoSamples);

cout << "\nNUM POINTS:" << pObj_geo->points().entries();

Are there any examples out there about how to access information about geometry

in a scene? I am looking to get at anything that a gdp would provide a sop.

It says that Mantra uses a subclass of the GU_Detail so I have a feeling that not all

the same info is available...?

Any help would be great ...

Thanks,

Phillip

There might be a couple of reasons that queryGeometry might return a null pointer... Perhaps you might want to check before dereferencing :-)

I believe you can get a null ptr back if

a) You are querying a null object (transform space)

b-) The handle is invalid

c) No geometry was defined for the object

d) The object is bound to a procedural (rather than geometry)

I think there are probably other cases.

[Phillip]

I believe my handle is valid, since I am able to print the name of the obj.

Also, I have tried querying both the obj that has the procedural attached,

as well as a separate geo node that contains geometry.

Is there an example of using:

const GU_Detail *queryGeometry(void *object_handle, int sample);

[crunch]

I believe my handle is valid, since I am able to print the name of the obj.

Also, I have tried querying both the obj that has the procedural attached,

as well as a separate geo node that contains geometry.

Is there an example of using:

const GU_Detail *queryGeometry(void *object_handle, int sample);

I've thrown one together pretty quickly.

This duplicates the source geometry specified on the procedural arguments, but then transforms the geomety to the bounding box specified on the procedural.

It's pretty dirt simple, but it seems to work for me.

You should see the green triangle as the source object and the red triangle which was duplicated by the procedural. You'll probably also see some debug stuff that I left in :-)

SimpleDup.tar.gz

[Phillip]

Thank you! This looks geat