【转帖】odgeboundblock2d3dgetminmaxpoints90
 

odgeboundblock2d/3d::getminmaxpoints()

odgeboundblock2d/3d::getminmaxpoints()
what do these methods return - min/max points of extents of the bbox (that is its extents in wcs) or min/max points of the bbox in its cs?
in acad they return "two opposite vertices of the minimal coordinate box containing the block", that is the 1st variant, but in dwgdirect there is a note for 3d: "the returned values are meaningful if and only if this object is a coordinate-aligned box"..

diamantex
# 12th december 2007, 09:07 am

registered user join date: sep 2003
location: russia
posts: 1,828
minpoint()/maxpoint() are returnned in wcs
the note for 3d is not quite correct. the points returned will always be in some sense min and max (at least, they are in the opposite corners), but, when the box is not axis aligned, they are min and max only if transfromed to bbox ocs.
vladimir

vkalinin
# 12th december 2007, 09:40 am

registered user join date: oct 2003
location: nizhny novgorod, russia
posts: 9

i checked the following simple case in 3d: see bbox.png attached, let the red square represent an odgeboundblock3d object. it's not axis-aligned and is set using something like set((1,1,0), (2,1,0), (-1,2,0), (0,0,1)). and getminmaxpoints() returns coords of blue points, that is (0,1,0) and (3,4,1). this does not fit the sentence "they are min and max only if transfromed to bbox ocs" or i misunderstand something?
attached images (12.3 kb, 5 views)


diamantex
# 12th december 2007, 10:03 am

registered user join date: sep 2003
location: russia
posts: 1,828
you are right, i didn't look at the class long enough. actually it returns corners of the smallest bounding axis-aligned box as min/max points.
vladimir

vkalinin

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minpoint()/maxpoint() are returnned in wcs
the note for 3d is not quite correct. the points returned will always be in some sense min and max (at least, they are in the opposite corners), but, when the box is not axis aligned, they are min and max only if transfromed to bbox ocs.
vladimir

i checked the following simple case in 3d: see bbox.png attached, let the red square represent an odgeboundblock3d object. it's not axis-aligned and is set using something like set((1,1,0), (2,1,0), (-1,2,0), (0,0,1)). and getminmaxpoints() returns coords of blue points, that is (0,1,0) and (3,4,1). this does not fit the sentence "they are min and max only if transfromed to bbox ocs" or i misunderstand something?
attached images (12.3 kb, 5 views)

you are right, i didn't look at the class long enough. actually it returns corners of the smallest bounding axis-aligned box as min/max points.
vladimir