When a plane coinsides with a seam we need to copy that trim curve. The existing curve belongs to the original shell surfaces and an intersection is otherwise not found. Fixes#540.
This set of changes covers all triangulation errors in issue 693. A point coincident with a triangle vertex is OK and needed for bridges, but sometimes the middle point has edges cutting through the triangle that make it a non-ear. We fix that and a couple of off-by-one error (that fixes one of the test cases).
This is the last long-running single-threaded part of the boolean code. On one test model this took Regenerate form 27 seconds down to 18s. The critical sections needed a name (into) because that object must not be modified while in use in different places.
The 3-plane intersection code fails to converge when a curve joins two tangent NURBS patches. This adds a new function for intersecting exact curves with a surface to avoid those failures. Fixes simplified test model for issue #315.
Create a new copy type for faces that includes the translation aspect of helical extrusions. Also swap the end remappings when the shell is inside out - this was also affecting some Revolve extrusions.
Resolve issue #489 helix has stairsteps.
Force helix axis line to 8 segments.
Grid triangulation to use a minimum of 4 segments for degree>1.
Adds twist dependence for grid triangulation with degree=1.
Added a max_dt parameter for PWL creation and use that for helical edges.
When checking the dot product of the tangents `tu` and `tv` to decide
in which direction to split a quad compare it to to LENGTH_EPS instead
of zero to avoid alternating triangle "orientations" when the tangents
are orthogonal (revolve, lathe etc.).
This improves the quality of the resulting triangle mesh.
Commit ea6db67 added an unusual isnan macro:
#define isnan(x) (((x) != (x)) || (x > 1e11) || (x < -1e11))
Commit 8bc322e adds a preprocessor guard that looks like it would
cause the isnan function from math.h to be preferred, but doesn't
actually do that on many platforms, e.g. glibc:
#ifndef isnan
# define isnan(x) (((x) != (x)) || (x > 1e11) || (x < -1e11))
#endif
This commit renames our isnan() to make it clear that it differs
from the standard library operation, and makes it a function.
Fixes#603.
* Limit u,v range between 0 and 1 in Newton. Fixes issue #471
* Change the math for projecting a point onto a plane to work better with non-orthogonal U,V derivatives in several places. Fixes#472.
Union and difference are optimized by replacing the expression
(!inShell && !inFace)
which is equivqlent to
(!inShell && !inSame && !inOpp)
with
outSide
which is equivalent, since SShell::Class::OUTSIDE is the only remaining possibility.
Allows distancing users from the internal "elem" member.
Add Get() and operator[].
Replace direct references to elem.
Make elem and elemsAllocated private in IdList/List.
