Gamasutra - Features


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by Jeff Lander
Gamasutra
February 03, 2000

This article originally appeared in the
February 1999 issue of:

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Features

Listing 2. Faster AABB Calculation Using Starting OBB.

///////////////////////////////////////////////////////////////////////////////
// Procedure: RecalcBBox
// Purpose: Recalculates the BBox associated with a bone based on the
// original bounding box. This is faster then the true BBox in
// most cases. However, this BBox is not as tight a fit.
///////////////////////////////////////////////////////////////////////////////

GLvoid COGLView::RecalcBBox(t_Bone *curBone, tVector *min,tVector *max)

{

/// Local Variables ///////////////////////////////////////////////////////////
tVector tempRes;
int loop;
///////////////////////////////////////////////////////////////////////////////

for (loop = 0; loop < 8; loop++) // LOOP THROUGH ALL 8 BBOX COORDS

{
MultVectorByMatrix(&curBone->matrix, &curBone->visuals->bbox[loop],&tempRes);
memcpy(&curBone->visuals->transBBox[loop],&tempRes,sizeof(tVector));
if (loop == 0)

{
memcpy(min,&tempRes,sizeof(tVector));
memcpy(max,&tempRes,sizeof(tVector));
}
else
{
if (tempRes.x > max->x) max->x = tempRes.x;
if (tempRes.y > max->y) max->y = tempRes.y;
if (tempRes.z > max->z) max->z = tempRes.z;
if (tempRes.x < min->x) min->x = tempRes.x;
if (tempRes.y < min->y) min->y = tempRes.y;
if (tempRes.z < min->z) min->z = tempRes.z;
}

}

}

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