【转帖】explode versus explodegeometry
 

explode versus explodegeometry
explode versus explodegeometry
coud you explain or give some clear directions about when to use explode() and when to use explodegeometry()...
the purpose being to decompose database resident entities into simpler geometry (curves in polylines, polylines in lines, solid3d and regions in 3dfaces or polyface mesh, etc)...
explodegeometry() uses entities' worlddraw() metod - it is universal, but it decomposes entity to the basic primitives - lines, arcs.
explode() is overloaded in all the entities, and may produce more complicated results. e.g. block insert explodes to the block contents with transform matrix applied.
vladimir
explode versus explodegeometry
quote:
explodegeometry() uses entities' worlddraw() metod - it is universal, but it decomposes entity to the basic primitives - lines, arcs.
it look like a get the reverse:
explode() a region returns a set of lines only
explodegeometry() a region returns a set of lines and 3dfaces, which is a more complex and complete production...
quote:
explode() is overloaded in all the entities, and may produce more complicated results. e.g. block insert explodes to the block contents with transform matrix applied.
ok, but this does not tell me if explode() should produce faces or mesh of faces ...
could not find in the doc what entitites are generated when explode() or explodegeometry() is applied to an entity.
i did not imagine that exploding an insert instanciates the block ! this is fabulously interesting !.. but explained nowhere, unless you try the hard way to explode() and geometryexplode() every kind of db entities...
thanks
when exploding the region you get its boundary (exploded).
when calling explodegeometry, region draws itself, using 'shell' graphics primitive, that is converted to 3dface by explodegeometry code.
that's what is said in arx docs about explode results. dd is compatible to arx in this case.
acdb3dsolid
regions, bodies
acdbbody
regions, bodies
acdb2dpolyline
lines, arcs
acdb3dpolyline
lines
acdbarc
self
acdbcircle
self
acdbdimension
solids, lines, text strings, points
acdbellipse
self
acdbleader
self
acdbline
self
acdbray
self
acdbspline
self
acdbxline
self
acdbface
self
acdbmline
lines
acdbmtext
one text entity for each line
acdbpoint
self
acdbpolyfacemesh
acdbface
acdbpolygonmesh
self
acdbregion
curves (splines, lines, arcs, circles)
acdbshape
self
acdbsolid
self
acdbtext
self
acdbtrace
self
vladimir