public bool RequiresSupport()
{
bool supportInScene = scene.VisibleMeshes().Any(i => i.WorldOutputType() == PrintOutputTypes.Support);
if (!supportInScene)
{
// there is no support in the scene check if there are faces that require support
var supportCandidates = scene.VisibleMeshes().Where(i => i.OutputType != PrintOutputTypes.Support);
// find all the faces that are candidates for support
foreach (var item in supportCandidates)
{
var matrix = item.WorldMatrix(scene);
for (int faceIndex = 0; faceIndex < item.Mesh.Faces.Count; faceIndex++)
{
bool aboveBed = false;
var face = item.Mesh.Faces[faceIndex];
var verts = new int[] { face.v0, face.v1, face.v2 };
foreach (var vertex in verts)
{
if (item.Mesh.Vertices[vertex].Transform(matrix).Z > .01)
{
aboveBed = true;
break;
}
}
if (aboveBed)
{
var face0Normal = item.Mesh.Faces[faceIndex].normal.TransformNormal(matrix).GetNormal();
var angle = MathHelper.RadiansToDegrees(Math.Acos(face0Normal.Dot(-Vector3Float.UnitZ)));
if (angle < MaxOverHangAngle)
{
// TODO: consider how much area all supported polygons represent
return(true);
}
}
}
}
}
return(false);
}
