Another rip question about rip software for a ...
old fag enthusiasts.
Ok. I almost finish Multi Cut Tool for XSI.
The cut through edges - DONE.
The edge ring cuts - DONE.
The plane cuts - ON THE WAY.
So the question is about plane slice mode and mainly about PICK
session, variations and algorithms.
I tried ToolContext.Pick() , Pickbuffer,
ToolContext.BeginPickDraw() (aka OGL select) in lots of
different variations, order etc.
And in most cases on my test mesh a have pick gaps.
The test mesh is a Sphere 3x3 divided 5 times. Pretty heavy.
Here is my current alg to get edges that we would cut:
01. Use Bresenham algorithm (or supercover algorithm) to
calculate 2d screen line as slice line.
02. Use all calculated in prev step screen coords to get
polygons from pick buffer ( or you can use BeginPickDraw() OGL
select session the same way).
03. Create parametric Plane (CPlane) - slice plane in direction
of camera focus and with a normal(cross product between screen
line and camera focus line).
04. For each edge of picked polygons we create parametric line
(CLine) and try to get intersection with a slice plane (CPlane).
If we get intersection in parameter range 0-1 we tacke
intersection coord and index of this edge.
This algorithm have lots of variations but the problem on a 02
step doesn't solved.
On a dense mesh we miss components (polygons or edges it doesn't
matter). I tried to get edges right away from ToolContext.Pick()
session - it miss components.
Tryed get edges (not polys) from pickbuffer - miss components.
In the end i use that preaty have calculations with a parametric
primitives, but it doesn't solve the problem.
http://c2n.me/3JT9JZt
http://c2n.me/3JT9PxS
So any ideas or suggestions are welcome.
I looking for method that get all edges and intersection coords
between MouseDown --- MouseUp screen line.
