protected void preComputeTextureTransform(DrawContext dc, SectorGeometry sg, Transform t)
{
Sector st = sg.getSector();
this.sgWidth = st.getDeltaLonRadians();
this.sgHeight = st.getDeltaLatRadians();
this.sgMinWE = st.getMinLongitude().radians;
this.sgMinSN = st.getMinLatitude().radians;
}
