/// <summary>
/// Translates a set of faces with an offset provided in local (model) coordinates.
///
/// This applies the mesh positions to both the <see cref="ProBuilderMesh"/> and the <see cref="UnityEngine.Mesh"/>.
/// </summary>
/// <param name="mesh">The mesh containing the faces that you want to translate.</param>
/// <param name="faces">The set of faces that you want to translate.</param>
/// <param name="offset">The offset to apply in local coordinates.</param>
public static void TranslateVertices(this ProBuilderMesh mesh, IEnumerable <Face> faces, Vector3 offset)
{
if (mesh == null)
{
throw new ArgumentNullException("mesh");
}
mesh.GetCoincidentVertices(faces, s_CoincidentVertices);
TranslateVerticesInternal(mesh, s_CoincidentVertices, offset);
}
/// <summary>
/// Translate a set of vertices with a world space offset.
/// <br />
/// Unlike most other mesh operations, this function applies the mesh positions to both ProBuilderMesh and the UnityEngine.Mesh.
/// </summary>
/// <param name="mesh"></param>
/// <param name="indexes">A distinct list of vertex indexes.</param>
/// <param name="offset">The direction and magnitude to translate selectedTriangles, in world space.</param>
/// <param name="snapValue">If > 0 snap each vertex to the nearest on-grid point in world space.</param>
/// <param name="snapAxisOnly">If true vertices will only be snapped along the active axis.</param>
internal static void TranslateVerticesInWorldSpace(this ProBuilderMesh mesh,
int[] indexes,
Vector3 offset,
float snapValue,
bool snapAxisOnly)
{
if (mesh == null)
{
throw new ArgumentNullException("mesh");
}
int i = 0;
mesh.GetCoincidentVertices(indexes, s_CoincidentVertices);
Matrix4x4 w2l = mesh.transform.worldToLocalMatrix;
Vector3 localOffset = w2l * offset;
Vector3[] verts = mesh.positionsInternal;
// Snaps to world grid
if (Mathf.Abs(snapValue) > Mathf.Epsilon)
{
Matrix4x4 l2w = mesh.transform.localToWorldMatrix;
var mask = snapAxisOnly ? new Vector3Mask(offset, Math.handleEpsilon) : Vector3Mask.XYZ;
for (i = 0; i < s_CoincidentVertices.Count; i++)
{
var v = l2w.MultiplyPoint3x4(verts[s_CoincidentVertices[i]] + localOffset);
verts[s_CoincidentVertices[i]] = w2l.MultiplyPoint3x4(ProBuilderSnapping.Snap(v, ((Vector3)mask) * snapValue));
}
}
else
{
for (i = 0; i < s_CoincidentVertices.Count; i++)
{
verts[s_CoincidentVertices[i]] += localOffset;
}
}
// don't bother calling a full ToMesh() here because we know for certain that the vertices and msh.vertices arrays are equal in length
mesh.positionsInternal = verts;
mesh.mesh.vertices = verts;
}
