csBox3 csReversibleTransform::This2Other (const csBox3 &box) const
{
if (m_t2o.IsIdentity())
{
csBox3 newBox (box);
newBox.SetCenter (This2Other (box.GetCenter()));
return newBox;
}
else
{
const csVector3 minA = box.Min ();
const csVector3 maxA = box.Max ();
csVector3 minB (v_o2t);
csVector3 maxB (v_o2t);
for (size_t i = 0; i < 3; ++i)
{
const csVector3 row = m_t2o.Row (i);
for (size_t j = 0; j < 3; ++j)
{
float a = row[j] * minA[j];
float b = row[j] * maxA[j];
if (a < b)
{
minB[i] += a;
maxB[i] += b;
}
else
{
minB[i] += b;
maxB[i] += a;
}
}
}
return csBox3 (minB, maxB);
}
}
float csHazeMeshObject::GetScreenBoundingBox (long cameranr,
long movablenr, float fov, float sx, float sy,
const csReversibleTransform& trans, csBox2& sbox, csBox3& cbox)
{
csVector2 oneCorner;
GetTransformedBoundingBox (cameranr, movablenr, trans, cbox);
// if the entire bounding box is behind the camera, we're done
if ((cbox.MinZ () < 0) && (cbox.MaxZ () < 0))
{
return -1;
}
// Transform from camera to screen space.
if (cbox.MinZ () <= 0)
{
// Sprite is very close to camera.
// Just return a maximum bounding box.
sbox.Set (-10000, -10000, 10000, 10000);
}
else
{
Perspective (cbox.Max (), oneCorner, fov, sx, sy);
sbox.StartBoundingBox (oneCorner);
csVector3 v (cbox.MinX (), cbox.MinY (), cbox.MaxZ ());
Perspective (v, oneCorner, fov, sx, sy);
sbox.AddBoundingVertexSmart (oneCorner);
Perspective (cbox.Min (), oneCorner, fov, sx, sy);
sbox.AddBoundingVertexSmart (oneCorner);
v.Set (cbox.MaxX (), cbox.MaxY (), cbox.MinZ ());
Perspective (v, oneCorner, fov, sx, sy);
sbox.AddBoundingVertexSmart (oneCorner);
}
return cbox.MaxZ ();
}