PolyPackUV Property Editor

These parameters allow you to choose the unfolding method for, and adjust the target bounding box of a Unique UVs projection.

ImportantThe result of a Unique UVs projection is different on 32-bit and 64-bit systems. To avoid problems when opening a scene on a different operating system, freeze the projection first — see Freezing Texture Projections [Texturing].

Unfolding

Flattening Method

Choose a method for flattening the Uvs:

Individual Poly Packing: using a planar projection method, this method assigns each polygon's UV coordinates to its own distinct piece of the texture so that no two polygons' coordinates overlap each other.

Angle Grouping: after deciding on a projection direction, this method groups neighboring polygons whose normal directions fall within a specified angle tolerance. This process is repeated until all of the object's polygons are in a group. The groups or islands are then assigned to distinct pieces of the texture so that no two islands' coordinates overlap each other.

In some scenarios, the Angle Grouping method may generate overlapping polygons within an island.

Angle Grouping Tolerance

When the Flattening Method is set to Angle Grouping, this setting specifies the angle tolerance within which neighboring polygons normal directions must fall for the polygons to be considered for the current group.

A higher Tolerance value creates larger islands, but also creates more distortion in the UV coordinates.
A lower Tolerance value creates smaller islands. It's important not to set the tolerance value too low since this can drastically increase the time it takes to unfold the object.

Packing Method

The algorithm used to lay out the polygons on the texture space.

Row packing is an older method provided for backwards compatibility.
Tight produces a better arrangement of polygons in almost all circumstances.

Pre-Smoothing

The Pre-Smoothing options apply various smoothing operations to a copy of the object's geometry. UV coordinates are generated based on the smoothed copy's geometry and are applied to the original object. The net effect is to smooth the UV coordinates.

NoteThe Pre Smoothing options produce better results for curved organic surfaces than for faceted mechanical objects.

Enable

Activates the smoothing options.

Strength

Specifies the degree to which the geometry should be smoothed before the object's polygons are grouped. This is useful for removing bumps and other sharp changes in the geometry that could make a given polygon fall outside of the Angle Grouping Tolerance.

The higher the Strength is set, the more distortion is created in the resulting UV coordinates.

Restrict to Concavities

When activated, pre-smoothing is restricted to concave areas of the smoothed copy of the object's geometry.

Target Bounding Box

These parameters allow you to adjust the target bounding box of the Unique UVs projection.

Lower Left Corner

U, V	Adjusting these values offsets the UV coordinates from the lower-left corner of the target texture. The offset is measured in UV coordinates, which are usually between 0 and 1, so a value of 0.5 will offset the coordinates by 50%.

Dimensions

Width/Height

Adjusting these values resizes the bounding box of the UV coordinates. The size is measured in UV coordinates, which are usually between 0 and 1, so a value of 0.5 will resize the coordinates by 50%.

Minimum Spacing

Explicit Pixel Spacing	When enabled, you must specify the resolution, in pixels, of the texture for which the UV coordinates are generated.
Target U, V Resolution	When explicit pixel spacing is enabled, these values specify the resolution, in pixels, of the target texture for which the unique UV coordinates are generated.
U, V Pixels	When explicit pixel spacing is enabled, these values specify the minimum distance, in pixels, between individual polygons' UV coordinates in U and V.
U, V	When explicit pixel spacing is disabled, these values specify the distance between individual polygons' UV coordinates. The distance is measured in UV coordinates.

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