Subdivide the bicubic surface up to eight times to increase the number of vertices and tangents. Then translate the vertices for a smaller region of the image for more precision. You should warp the surface with a small number of subdivisions to obtain the best results. After applying some deformations to a large portion of the surface, subdivide the surface further and perform deformations on a more localized region of the surface.
To subdivide extended bicubics:
- From the Vertices menu, click Subdivide.
You can click the subdivide button up to eight times to further subdivide the surface. Click Merge to undo subdivide operations.
- Transform the tangents to achieve the effect you want.
To move the reference point:
- Select the reference point.
The reference point turns red when selected.
- Drag the reference point to a new location, or use the X, Y and Z vertex fields to assign a new coordinate for the reference point.
To rotate multiple surface points:
- Set the reference point values you want to use as the axis of origin using the X, Y, Z Vertex Position fields.
- Select multiple surface points by pressing Ctrl and dragging to select the surface points.
- From the Tools box, select Rotate.
A 3D trackball appears on the reference point.
- Use the 3D trackball to rotate the reference point and selected points.
All selected points rotate around the reference point.
To scale multiple surface points:
- Set the reference point values you want to use as the axis of origin using the X, Y, Z Vertex Position fields.
- Select multiple surface points by pressing Ctrl and dragging to select the surface points.
- From the Tools box, select Scale.
- Drag in a direction in the image window to scale accordingly.