Horde3D

I've been reading the code of Horde3d for a few days.
I've noticed that the glDrawRangeElements() in drawModels(),

glDrawRangeElements( GL_TRIANGLES, meshNode->getVertRStart(), meshNode->getVertREnd(),
meshNode->getBatchCount(),
curGeoRes->_16BitIndices ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT,
(char *)0 + meshNode->getBatchStart() *
(curGeoRes->_16BitIndices ? sizeof( short ) : sizeof( int )) );

How dose "(char *)0 + meshNode->getBatchStart() *(curGeoRes->_16BitIndices ? sizeof( short ) : sizeof( int ))" mean ?

Is this code get a pointer to Triangle Indices?

Thx

It is an offset into the vertex buffer object containing the indices.

If one were to use vertex arrays instead, one would pass a pointer to the start of the indices, but since we use vertex buffer objects, it has to be an offset from the start of the buffer.

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Tristam MacDonald - [swiftcoding]