There are those of us that are using this that are not making molds, and
can only guess at what “pull direction” means. I have a vague idea of what
"draft angle" means, but I was using DraftAngleAnalysis to understand the
location of the steepest point of a surface that I am working with, and to
see just how steep it was.
You should define what a Rhino operation does using Rhino concepts, without
assuming that the user is a mold maker, a brick maker, a lawyer, or …
Personally, I haven’t done much with construction planes … I just use
what’s there in the usual set-up.
If you feel that “the z-axis of the construction plane” is well-defined,
then you can say
Let D be the Direction of a surface at some point. Then the "draft angle"
of the surface at that point is
90 degrees if D points in the same direction as the z-axis of the
construction plane,
0 degrees if D is perpendicular to the z-axis of the construction plane
-90 degrees if D points in the opposite direction from the z-axis of the
construction plane,
As for the suggestion:
"The normal direction of the surface is the same as the pull direction of
the mold. You can check this with the Dir command."
I can only ask "What mold? You mean that green stuff on my piece of
cheese?"
What is the noun to which “this” refers in your suggestion? I can’t
tell.
Actually, I can guess what you are trying to say … and you are far, far
from being precise.
(1) A mold is a three-dimensional solid object, usually made out of
metal. There are no pieces of metal in Rhino.
(2) A surface can be used to define TWO solids, one on this side of the
surface, and one on that side of the surface. And in fact, I am using
the same surface in both ways: One to define the object I am making, and one
to define the cradle in which to hold it while I am working on it.
(3) A surface has TWO (unit) normals, pointing in opposite directions.
So I suggest you stop trying to talk about pieces of metal, and just
carefully tell the reader what Rhino does, in terms involving only Rhino
objects… Remember: There are no molds in Rhino.
Dave Golber
In a message dated 4/8/2016 17:31:24 Eastern Daylight Time,
steve@mcneel.com writes:
_pascal_ (http://discourse.mcneel.com/users/pascal) McNeel
April 8
@margaret (http://discourse.mcneel.com/users/margaret) , @davidgolber
(http://discourse.mcneel.com/users/davidgolber) - I am not sure - Help has
this:
The pull direction for DraftAngleAnalysis is the z-axis of the
construction plane that is in the active viewport when the command starts.
The normal direction of the surface is the same as the pull direction of
the mold. You can check this with the Dir command.
Changing the construction plane before using DraftAngleAnalysis lets you
define any direction as the pull direction.
We could re-word that perhaps:
The normal direction of a the object ( Dir command, Analyze menu >
Direction) should correspond to the side of the mold that will be pulled from it.
??
-Pascal
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In Reply To
margaret (http://discourse.mcneel.com/users/margaret) McNeel
April 8 Pascal, can you make a YT item for this. I am not clear what to
put into the help that would improve things.
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