/// <summary>
/// Picks the <see cref="Face" /> objects contained within a rect (rectangular selection).
/// </summary>
/// <param name="cam">Use this camera to evaluate whether any face object(s) are inside the `rect`.</param>
/// <param name="rect">Rect is in GUI space, where 0,0 is the top left of the screen, and `width = cam.pixelWidth / pointsPerPixel`.</param>
/// <param name="selectable">The collection of objects to check for selectability. ProBuilder verifies whether these objects fall inside the `rect`.</param>
/// <param name="options">The options that define whether to include mesh elements that are hidden and whether to consider elements that only partially fall inside the `rect`.</param>
/// <param name="pixelsPerPoint">
/// Scale the render texture to match `rect` coordinates. By default, ProBuilder doesn't scale the texture (the default value is set to 1.0),
/// but you can specify <see cref="UnityEditor.EditorGUIUtility.pixelsPerPoint" /> if you need to use a different number of screen pixels per point.</param>
/// <returns>A dictionary of ProBuilderMesh and Face objects that are in the selection `rect`. </returns>
public static Dictionary <ProBuilderMesh, HashSet <Face> > PickFacesInRect(
Camera cam,
Rect rect,
IList <ProBuilderMesh> selectable,
PickerOptions options,
float pixelsPerPoint = 1f)
{
if (options.depthTest && options.rectSelectMode == RectSelectMode.Partial)
{
return(SelectionPickerRenderer.PickFacesInRect(
cam,
rect,
selectable,
(int)(cam.pixelWidth / pixelsPerPoint),
(int)(cam.pixelHeight / pixelsPerPoint)));
}
var selected = new Dictionary <ProBuilderMesh, HashSet <Face> >();
foreach (var pb in selectable)
{
if (!pb.selectable)
{
continue;
}
HashSet <Face> selectedFaces = new HashSet <Face>();
Transform trs = pb.transform;
Vector3[] positions = pb.positionsInternal;
Vector3[] screenPoints = new Vector3[pb.vertexCount];
for (int nn = 0; nn < pb.vertexCount; nn++)
{
screenPoints[nn] = cam.ScreenToGuiPoint(cam.WorldToScreenPoint(trs.TransformPoint(positions[nn])), pixelsPerPoint);
}
for (int n = 0; n < pb.facesInternal.Length; n++)
{
Face face = pb.facesInternal[n];
// rect select = complete
if (options.rectSelectMode == RectSelectMode.Complete)
{
// face is behind the camera
if (screenPoints[face.indexesInternal[0]].z < cam.nearClipPlane)
{
continue;
}
// only check the first index per quad, and if it checks out, then check every other point
if (rect.Contains(screenPoints[face.indexesInternal[0]]))
{
bool nope = false;
for (int q = 1; q < face.distinctIndexesInternal.Length; q++)
{
int index = face.distinctIndexesInternal[q];
if (screenPoints[index].z < cam.nearClipPlane || !rect.Contains(screenPoints[index]))
{
nope = true;
break;
}
}
if (!nope)
{
if (!options.depthTest ||
!HandleUtility.PointIsOccluded(cam, pb, trs.TransformPoint(Math.Average(positions, face.distinctIndexesInternal))))
{
selectedFaces.Add(face);
}
}
}
}
// rect select = partial
else
{
Bounds2D poly = new Bounds2D(screenPoints, face.edgesInternal);
bool overlaps = false;
if (poly.Intersects(rect))
{
// if rect contains one point of polygon, it overlaps
for (int nn = 0; nn < face.distinctIndexesInternal.Length && !overlaps; nn++)
{
Vector3 p = screenPoints[face.distinctIndexesInternal[nn]];
overlaps = p.z > cam.nearClipPlane && rect.Contains(p);
}
// if polygon contains one point of rect, it overlaps. otherwise check for edge intersections
if (!overlaps)
{
Vector2 tl = new Vector2(rect.xMin, rect.yMax);
Vector2 tr = new Vector2(rect.xMax, rect.yMax);
Vector2 bl = new Vector2(rect.xMin, rect.yMin);
Vector2 br = new Vector2(rect.xMax, rect.yMin);
overlaps = Math.PointInPolygon(screenPoints, poly, face.edgesInternal, tl);
if (!overlaps)
{
overlaps = Math.PointInPolygon(screenPoints, poly, face.edgesInternal, tr);
}
if (!overlaps)
{
overlaps = Math.PointInPolygon(screenPoints, poly, face.edgesInternal, br);
}
if (!overlaps)
{
overlaps = Math.PointInPolygon(screenPoints, poly, face.edgesInternal, bl);
}
// if any polygon edge intersects rect
for (int nn = 0; nn < face.edgesInternal.Length && !overlaps; nn++)
{
if (Math.GetLineSegmentIntersect(tr, tl, screenPoints[face.edgesInternal[nn].a], screenPoints[face.edgesInternal[nn].b]))
{
overlaps = true;
}
else if (Math.GetLineSegmentIntersect(tl, bl, screenPoints[face.edgesInternal[nn].a], screenPoints[face.edgesInternal[nn].b]))
{
overlaps = true;
}
else if (Math.GetLineSegmentIntersect(bl, br, screenPoints[face.edgesInternal[nn].a], screenPoints[face.edgesInternal[nn].b]))
{
overlaps = true;
}
else if (Math.GetLineSegmentIntersect(br, tl, screenPoints[face.edgesInternal[nn].a], screenPoints[face.edgesInternal[nn].b]))
{
overlaps = true;
}
}
}
}
// don't test occlusion since that case is handled special
if (overlaps)
{
selectedFaces.Add(face);
}
}
}
selected.Add(pb, selectedFaces);
}
return(selected);
}
/// <summary>
/// Picks the <see cref="Edge" /> objects contained within a rect (rectangular selection).
/// </summary>
/// <param name="cam">Use this camera to evaluate whether any edge object(s) are inside the `rect`.</param>
/// <param name="rect">Rect is in GUI space, where 0,0 is the top left of the screen, and `width = cam.pixelWidth / pointsPerPixel`.</param>
/// <param name="selectable">The collection of objects to check for selectability. ProBuilder verifies whether these objects fall inside the `rect`.</param>
/// <param name="options">The options that define whether to include mesh elements that are hidden and whether to consider elements that only partially fall inside the `rect`.</param>
/// <param name="pixelsPerPoint">
/// Scale the render texture to match `rect` coordinates. By default, ProBuilder doesn't scale the texture (the default value is set to 1.0),
/// but you can specify <see cref="UnityEditor.EditorGUIUtility.pixelsPerPoint" /> if you need to use a different number of screen pixels per point.</param>
/// <returns>A dictionary of ProBuilderMesh and Edge objects that are in the selection `rect`. </returns>
public static Dictionary <ProBuilderMesh, HashSet <Edge> > PickEdgesInRect(
Camera cam,
Rect rect,
IList <ProBuilderMesh> selectable,
PickerOptions options,
float pixelsPerPoint = 1f)
{
if (options.depthTest && options.rectSelectMode == RectSelectMode.Partial)
{
return(SelectionPickerRenderer.PickEdgesInRect(
cam,
rect,
selectable,
true,
(int)(cam.pixelWidth / pixelsPerPoint),
(int)(cam.pixelHeight / pixelsPerPoint)));
}
var selected = new Dictionary <ProBuilderMesh, HashSet <Edge> >();
foreach (var pb in selectable)
{
if (!pb.selectable)
{
continue;
}
Transform trs = pb.transform;
var selectedEdges = new HashSet <Edge>();
for (int i = 0, fc = pb.faceCount; i < fc; i++)
{
var edges = pb.facesInternal[i].edgesInternal;
for (int n = 0, ec = edges.Length; n < ec; n++)
{
var edge = edges[n];
var posA = trs.TransformPoint(pb.positionsInternal[edge.a]);
var posB = trs.TransformPoint(pb.positionsInternal[edge.b]);
Vector3 a = cam.ScreenToGuiPoint(cam.WorldToScreenPoint(posA), pixelsPerPoint);
Vector3 b = cam.ScreenToGuiPoint(cam.WorldToScreenPoint(posB), pixelsPerPoint);
switch (options.rectSelectMode)
{
case RectSelectMode.Complete:
{
// if either of the positions are clipped by the camera we cannot possibly select both, skip it
if ((a.z < cam.nearClipPlane || b.z < cam.nearClipPlane))
{
continue;
}
if (rect.Contains(a) && rect.Contains(b))
{
if (!options.depthTest || !HandleUtility.PointIsOccluded(cam, pb, (posA + posB) * .5f))
{
selectedEdges.Add(edge);
}
}
break;
}
case RectSelectMode.Partial:
{
// partial + depth test is covered earlier
if (Math.RectIntersectsLineSegment(rect, a, b))
{
selectedEdges.Add(edge);
}
break;
}
}
}
}
selected.Add(pb, selectedEdges);
}
return(selected);
}