message: Fix sheet drop shadow geometry.
  TFS#910807
diff: @@ -42,16 +42,16 @@ export class SheetBorder {
  const shadowWidth = .01 * Math.sqrt(width * width + height * height);
  const shadow: Point3d[] = [
  Point3d.create(shadowWidth, 0),
  - Point3d.create(shadowWidth, -shadowWidth),
  - Point3d.create(width + shadowWidth, -shadowWidth),
  - Point3d.create(width + shadowWidth, height - shadowWidth),
  - Point3d.create(width, height - shadowWidth),
  Point3d.create(width, 0),
  + Point3d.create(width, height - shadowWidth),
  + Point3d.create(width + shadowWidth, height - shadowWidth),
  + Point3d.create(width + shadowWidth, -shadowWidth),
  + Point3d.create(shadowWidth, -shadowWidth),
  Point3d.create(shadowWidth, 0),
  ];
  - if (context) {
  +
  + if (context)
  context.viewport.worldToViewArray(shadow);
  - }
  // Gradient
  const gradient = new Gradient.Symb();
  