This is a combined effort from Jens, Ton who finished the code here on my machine, and myself putting in the little menu toggle and committing :).
Turn it on and off in the UV/Image window menu UVs -> LSCM Live Transform. It recalculates the LSCM within the transform loop when you're transforming pinned vertices, so it gives realtime feedback - a real time saver! Note: this is much more powerful than proportional edit, since it's properly calculating LSCM using the correct edge angles, etc.
I recorded a quicky demo video here: http://orange.blender.org/wp-content/themes/orange/images/media/lscm_live.mov (quicktime animation codec)
- Moved Weld/Align out of transform code, now it's a menu.
- Removed confirmation popups for LSCM unwrapping in the uv editor, didn't
make sense anymore now we have undo.
- Extended select linked, to work more like it does in edit mode:
- L: select linked uvs/faces under the mouse
- Shift+L: select/deselect linked uvs/faces under the mouse
(like shift+click for selecting single uvs/faces)
- Ctrl+L: how L worked before
- More accurate uv selection: when selecting one uv from a group of uvs that
are in the same position, it now selects the uv belonging to the face the
mouse is over, instead of a random uv.
- 'View Selected' (numpad .-key) for both faceselect mode and the uv editor.
The algorithm used before to split up the mesh before unwrapping was based on
vertices, resulting in leakage in some setups. Now it's edge based, allowing to
select only two edges of a triangle, and not automatically selecting the third.
http://www.loria.fr/~levy/Galleries/LSCM/index.htmlhttp://www.loria.fr/~levy/Papers/2002/s2002_lscm.pdf
Implementation Least Squares Conformal Maps parameterization, based on
chapter 2 of:
Bruno Levy, Sylvain Petitjean, Nicolas Ray, Jerome Maillot. Least Squares
Conformal Maps for Automatic Texture Atlas Generation. In Siggraph 2002,
July 2002.
Seams: Stored as a flag (ME_SEAM) in the new MEdge struct, these seams define
where a mesh will be cut when executing LSCM unwrapping. Seams can be marked
and cleared in Edit Mode. Ctrl+EKEY will pop up a menu allowing to Clear or Mark
the selected edges as seams.
Select Linked in Face Select Mode now only selects linked faces if no seams
separate them. So if seams are defined, this will now select the 'face group'
defined by the seams. Hotkey is still LKEY.
LSCM Unwrap: unwrap UV's by calculating a conformal mapping (preserving local
angles). Based on seams, the selected faces will be 'cut'. If multiple
'face groups' are selected, they will be unwrapped separately and packed in
the image rectangle in the UV Editor. Packing uses a simple and fast
algorithm, only designed to avoid having overlapping faces.
LSCM can be found in the Unwrap menu (UKEY), and the UV Calculation panel.
Pinning: UV's can be pinned in the UV Editor. When LSCM Unwrap is then
executed, these UV's will stay in place, allowing to tweak the solution.
PKEY and ALT+PKEY will respectively pin and unpin selected UV's.
Face Select Mode Drawing Changes:
- Draw Seams option to enable disable drawing of seams
- Draw Faces option to enable drawing of selected faces in transparent purple
- Draw Hidden Edges option to enable drawing of edges of hidden faces
- Draw Edges option to enable drawing of edges of visible faces
The colors for these seams, faces and edges are themeable.
