Hello Georg,
Wünsch wrote:
> Hi Everybody,
> I am trying to extraxt vertices and indices
> from a Geometry into an Array and just cant
> get the clue, please somebody help me out,
> I guess its pretty simple:
>
> NodePtr node;
> NodeCorePtr core = node->getCore();
>
> string type(core->getTypeName());
> if (type == "Geometry") { // BTW: can I do this faster?
>
> GeometryPtr geo = GeometryPtr::dcast(core);
the faster way to do this:
NodePtr node;
GeometryPtr geo = GeometryPtr::dcast(node->getCore());
if(geo != NullFC)
// ...
> // and now I am lost.
> // where I want to get to is something like this:
>
> int num_vertices;
> float* vertices[];
> geo->getVertices(num_vertices, vertices);
GeoPositionsPtr verts = geo->getPositions();
verts->getSize(); // returns number of vertices
verts->getValue(index); // returns vertex index as Pnt3f (independent
from the actual type stored)
// for efficient access
GeoPositions3fPtr verts3f = GeoPositions3fPtr::dcast(verts);
GeoPositions3f::StoredFieldType &vertField = verts3f->getField();
vertField->size(); // returns number of vertices
vertField[index]; // returns vertex index as Pnt3f
> int num_indices;
> int* indices[];
> geo->getIndices(num_indices, indices);
this is similar as above, just replace "Positions" with "Indices".
> How can I copy the
> vertex and index data from the Geometry
> into the two arrays? I guess something
> similar should happen when the opengl
> content is actually being drawn. But I
> cant find it. please help me.
More information on this can be found in the tutorial, which also
explains the different indexing methods. The tutorial can be found here:
<http://opensg.vrsource.org/trac/wiki/Tutorial>, the page on geometry is
here: <http://opensg.vrsource.org/trac/wiki/Tutorial/OpenSG1/Geometry>
Hope it helps,
Carsten
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