On 10/22/2012 11:15 PM, wh_xiexing wrote: > i have hundreds of millions of points to render. i think the Geometry > 's setVertexArray (Vec3Array) is time consuming . > for every point , it must construct a Vec3 class, and put it into the > array.
Not true, you can create a Vec3Array out of an array of floats with nothing but a type cast. The Vec* and Vec*Array classes were designed to line up data contiguously in memory so that OpenGL could use it directly and efficiently (note that there are no virtual methods in the Vec* classes). There's no reason to modify OSG to do what you want: // Construct an array of floats float * lotsOfPoints = new float[count]; // Fill up the float array with point data ... // Construct a Vec3Array out of the float data ref_ptr<Vec3Array> array = new Vec3Array(count/3, (Vec3 *) lotsOfPoints); // Assign the Vec3Array to Geometry ref_ptr<Geometry> geom = new Geometry(); geom->setVertexArray(array); --"J"
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