Hello,
first, thank you for your help Jean and Jason. Jean this is nearly what
I want. But with getDataPointer I get a Vec3 pointer. But I want a
pointer to the vertex component x, y and z.
A example, I create a vertex array and pass float pointer. The pointer
point to the values. In the loop I want to change the values. Finally
the geometry should be change.
Simple example:
------------------------
//... init geometry (geom) and vertex array (vertices)
float x = 1;
float y = 1;
float* ptrX = &x; // pointer to x value
float* ptrY = &y; // pointer to y value
vertices->push_back( osg::Vec3(0,0,0.0) );
vertices->push_back( osg::Vec3(ptrX, ptrY, 0.0) );
//... add vertex array to geom
geom->setDataVariance(osg::Object::DYNAMIC);
geom->setUseDisplayList(false);
// in the animation loop
x = 5;
y = 2;
geom->dirtyDisplayList();
Is it understandable and is it possible?
Cheers,
Martin
Am 09.09.2009 20:10, schrieb Jean-Sébastien Guay:
Hi Martin,
Now I change the values of _x and _y during the runtime, but the
geometry isn't changing. I would like pass a pointer to the osg::Vec3
and use the function "dirtyDisplayList".
Well, maybe I don't understand something, but you can always get the
vertices from the array and modify them.
osg::Vec3f* vertexData = (osg::Vec3f*)vertices->getDataPointer();
Then vertexData is an array [0..nVertices-1] of Vec3f, and if you know
which index the vertex was inserted at, you can modify it there:
vertexData[index].set(x, y, z);
Hope this helps,
J-S
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