/// <summary>
/// Reset the AutoUnwrapParameters of a set of faces to best match their current UV coordinates.
/// </summary>
/// <remarks>
/// Auto UVs do not support distortion, so this conversion process cannot be loss-less. However as long as there
/// is minimal skewing the results are usually very close.
/// </remarks>
internal static void SetAutoAndAlignUnwrapParamsToUVs(ProBuilderMesh mesh, IEnumerable <Face> facesToConvert)
{
var destinationTextures = mesh.textures.ToArray();
var faces = facesToConvert as Face[] ?? facesToConvert.ToArray();
foreach (var face in faces)
{
face.uv = AutoUnwrapSettings.defaultAutoUnwrapSettings;
face.elementGroup = -1;
face.textureGroup = -1;
face.manualUV = false;
}
mesh.RefreshUV(faces);
var unmodifiedProjection = mesh.texturesInternal;
foreach (var face in faces)
{
var trs = CalculateDelta(unmodifiedProjection, face.indexesInternal, destinationTextures, face.indexesInternal);
var uv = face.uv;
// offset is flipped for legacy reasons. people were confused that positive offsets moved the texture
// in negative directions in the scene-view, but positive in UV window. if changed we would need to
// write some way of upgrading the unwrap settings to account for this.
uv.offset = -trs.translation;
uv.rotation = trs.rotation;
uv.scale = trs.scale;
face.uv = uv;
}
mesh.RefreshUV(faces);
}
// 2020/8/23 - scaled auto UV faces now have an offset applied to their projected coordinates so that they
// remain static in UV space when the mesh geometry is modified
internal static void UpgradeAutoUVScaleOffset(ProBuilderMesh mesh)
{
var original = mesh.textures.ToArray();
mesh.RefreshUV(mesh.facesInternal);
var textures = mesh.texturesInternal;
foreach (var face in mesh.facesInternal)
{
if (face.manualUV)
{
continue;
}
var utrs = CalculateDelta(original, face.indexesInternal, textures, face.indexesInternal);
var auto = face.uv;
auto.offset += utrs.translation;
face.uv = auto;
}
}
