Some pain in the as face behavering problems
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I experience lot's of SU behaviour which I can not explain to myself, maybe somone can clar things up.
e.g.:
When I draw a simple rectangle and then draw a simple circle into it, then they merge togther and wehn I move the circle vertically up a three dimensional shape starts to originates.
That works not just with a cirlce, AFAIk that should work with any face - rectangles, traingles, ..., or with any other flat geometric shape.
I mean I tried it with rectangles, circles, tringles and it works just fine. But it does not work with a 2D shape which I have drawn with the line and the curve tool.
It is not a group or a compound, the 2D shape is closed, so it should actually merge to the surface (reactangel) underneath it but it does not.
When I move it vertically up there is no three dimensional shape starting to build up, why is that so?
I'd like that it doe's that.
Another weerd behaviour is that when I move the 2D shape within the rectangle and then double click on the face sometimes it gets selcetd (surface and boundaries get blue) but sometimes not and the whole rectangle gets selected - so it behaves as the 2D shape would not be closed.
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force autofold by pressing the alt key (command for Macs) as you move in the blue axis.
You can also use the up arrow key for the same thing.Get move tool click on the shape to move, click down on the alt key--wait for two ovals to appear by the cursor and then make the move.
SU tries to keep some elements moving within a plane. Autofold allows it to move other ways and allows the face to fold into multiple faces.
In you selection problem: The shape edges may not actually all lie on the face or may not actually be closed.
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THX for your reply.
I was ( I am) aware of the autold function - except that it is called autofold.
Autofold is exactly what I tried to do with my plane shape - but it does not work.
I really think the edges of my shape are closed otherwise It should not be possible to fill it with a surface. 8look at the picture)
@unknownuser said:
In you selection problem: The shape edges may not actually all lie on the face or may not actually be closed.
How can that be that the edges of a plan face may not lie all on the face ?
It is imposible for a plane shape that some points don't lie on a face and some do, that is only able with non planar shapes - or do I get something wrong here.
I uploded the SU file, would be really nice if someone could have a look.
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Hi
extrude the section up and down, intersect with model, clean up, fixed. it can auto-fold
the section must be close to, but not exactly in same plane
Philip
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I thought you were talking about two situations. The edges do lie on the face of the closed shape, but that shape is not lying in the rectangular face. If you use Tools /Sandbox /Drape the shape will be made to lie on the face and act correctly.
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I took a look at your model:
#1 The shape does not lay on the surface
#2 when you move the shape to the surface (+- 18,4mm) you will see the shape is not coplanar with the surface. -
The tip with extruding the shape, intersect it and cleaning up has fixed the problem.
But I am still unhapy because I dont get why SU does what it does and I'd like to understand.
@unknownuser said:
I took a look at your model:
#1 The shape does not lay on the surface
#2 when you move the shape to the surface (+- 18,4mm) you will see the shape is not coplanar with the surface.I belive you that the shape is not coplanar with the surface but I do not understand it.
Because shouldn't it be coplanar with the surface (rectangle) when SU tell me "On Face" ?
- the only other option is that the shape itself is not coplanar, but It sems as it would be, but maybe there is some tiny glitch with it, is there an option to indicate if the shape is planar?
... I was actually thinking that the circumstance that the shape is filled, indicates that it is planar, because if it would not be planar it would not be filled.
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I think it is about SU tolerance, it seems to make some round up. When it happens you may get mad.
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Hi:
This has occasionally happened in my modeling. When you get the cue "on face" and you click, a slight movement of your mouse hand will drift it off the cue, while the camera is still focused on the larger plane.
Actually, the curved part of your shape appears to be below the target plane and the other end seems to be above the plane. Your shape is so close to the larger plane that the highlighting shows through your shape and gives the impression that it is coplanar.
Since you have found a solution, this comment is just academic.If your geometry has to be exact, then the extrude intersect procedure will produce a section slightly different in shape and area than if it were already coplanar and intersected. Again, this is a moot point.
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Because you geometry is quite large the small inaccuracies are less obvious.
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THX for all the comments.
@unknownuser said:
Hi:
This has occasionally happened in my modeling. When you get the cue "on face" and you click, a slight movement of your mouse hand will drift it off the cue, while the camera is still focused on the larger plane.
Actually, the curved part of your shape appears to be below the target plane and the other end seems to be above the plane. Your shape is so close to the larger plane that the highlighting shows through your shape and gives the impression that it is coplanar.
Since you have found a solution, this comment is just academic.No it's not
- I think you make some interesting points here.@unknownuser said:
If your geometry has to be exact, then the extrude intersect procedure will produce a section slightly different in shape and area than if it were already coplanar and intersected. Again, this is a moot point.
Yea, when I was thinking about the extrude/intersect-fix-methode or the drape- methode I relized that the outcome will be actually different shape.
So when something has to be totally exact that is not really the way to go.
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It really comes down to taking care, and checking your actions by getting used to orbiting for a better view or repositioning to ensure a correct snap. Sort of like developing a tolerance for tolerances in the program. Continued use will help develop your sense of what to expect.
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newnoob;
What you are showing is typical of folks assuming they are doing things correctly and in fact that is not the case. If you are really interested in understanding the issue then you should post your OP model .There are several suggestion to help you;
First and foremost learn and use the SU inference engine;Secondly draw a ground plane and draw your shape on that to make sure it is planar;
Thirdly do the same for the rect and make sure to use inference in both cases. If you do not clicking of the mouse can cause very small inadvertent movement which can cause problems;
Forth set units precision( this is display ) to max, use the text tool and check the vertex x,y,z. This is not 100% but since SU uses 32 bit float ( 24 bit significant precision( 23 explicitly stored), sign bit 1, exponent
this may show an issue whereas lesser display precision will not.
Note, when you click on the rect face and the face shows in your shape you know your model is wrong.
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