Set from Current Edges

Replaces any previously defined cut lines with the currently selected edges. Use this if you want to start over with a completely different cut line.

Remove from Cut Line

Removes the selected edges from the list of edges to use as cut lines.

Add to Cut Line

Adds the selected edges to the list of edges to use as cut lines.

Select Cut Line

Selects the edges defined as cut lines and highlights them in the 3D views.

Unfold

Creates the initial unfolding and stores it in a texture UV property called Unfold. Once the initial unfolding has been created, this button changes to Update Unfold.

Update Unfold

Recalculates the unfold based on the current settings and stores the new unfolding in the Unfold texture UV property.

Iterations

The number of times to run the adjusting algorithm. At higher values, the polygon areas are more proportional to the polygon areas on the 3D object but the edge angles become more distorted.

+ / –

Click these buttons to increment or decrement the Iterations slider.

Stretching

Controls how strongly the surface stretching is affected on each iteration of the adjustment algorithm. Tight gives more accurate results than Normal or Coarse but takes longer to compute.

Live adjusting

Check this box to see the results in the texture editor as you make changes to the adjustment settings. Note that this can cause delays as the texture editor gets updated, particularly with settings that require lengthy calculations.

If you leave this option off, click Adjust to update the texture editor manually.

Adjust

Click to update the texture editor with your changes to the adjustment settings when Live adjustment is off.

Live Packing

Check this box to see the results in the texture editor as you make changes to the packing settings. Note that this can cause delays as the texture editor gets updated, particularly with settings that require lengthy calculations.

If you leave this option off, click Pack to update the texture editor manually.

Pack

Click to update the texture editor with your changes to the packing settings when Live Packing is off.

Pieces

Controls the order in which the UV islands are arranged when packing.

• Increasing in size finds a spot for the smallest island, and then moves on to find a spot for the next smallest, and so on.

• Decreasing in size finds a spot for the largest island, then the next largest, and so on. This is the default setting because it generally finds an efficient packing.

• Random order lays out the pieces in a random order. You can change the sequence using the Random seed parameter.

Random seed

Changes the order in which the UV islands are packed. This parameter has an effect only when Pieces is set to Random order. Different values may result in more or less efficient arrangements — try different values until you find one that works well for a particular unfolding.

Spacing

Controls the distance between UV islands. A value of 0.0 lets islands touch, while a value of 1.0 puts each island in its own row.

Positioning

Controls the increments used when trying to place UV islands. Very precise is the most likely to find optimal placements but takes the longest to calculate, while Coarse is the fastest to calculate but may not give the best arrangement. Precise and Normal fall in-between the two extremes.

Rotation offset

Controls the starting orientation of the UV islands, before the packing algorithm tries placing the islands at rotational increments determined by the Rotation accuracy.

Rotation accuracy

Controls the rotational increments in degrees that the packing algorithm uses when trying to place the UV islands in an optimal arrangement. If this option is set to disabled, the packing algorithm does not try out different orientations but simply uses the Rotation offset.

Scale reference

Controls how UV islands are scaled with respect to each other:

• use boundary length preserves the ratios of the island boundary lengths.

• use surface area preserves the ratios of the island areas.

Global rotation

Rotates the entire arrangement of all UV islands.

Global scaling

Controls how the islands fit into the UV space.

• best fit tries to place the islands as efficiently as possible. This may result in some wasted space.

• squarify stretches the result in either U or V so that the complete arrangement of UV islands occupies a squarish area. This may result in distortion (for example, circles become ellipses).

Box packing

Uses the bounding box of each UV island when packing, rather than the islands’ actual outline. This speeds up the computation but typically results in more wasted space. It can be useful when packing an object with very many small islands.