Geometry size not consistent in SU 2015
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I don't know why axis orientation should affect it. Perhaps it has to do with having length snapping enabled? Try working with it disabled for awhile and see if that has any impact.
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@dave r said:
I don't know why axis orientation should affect it. Perhaps it has to do with having length snapping enabled? Try working with it disabled for awhile and see if that has any impact.
I actually used numeric input for all dimensions and axis inference. So, length snapping has nothing to do with his. Once I input a size and hit enter, it should go for that size, shouldn't ? The same with push-pull.
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It's the only thing different I see in your Units setup from mine so I thought it worth a try. I never use or want Length Snapping.
I should have done this before. Note the x and z coordinates of the end points of the line. The line is a little off axis. I don't know why that is. There are several things that could account for it.
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I see that off-axis... can't figure it why either. And is incredibly small displacement too. How can I check is my XYZ axis are perfectly perpendicular? As I said, the model's axis might be modified to align to the topo file.
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I would follow Daves suggestion and try without the length snapping...
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I moved the model away from the origin a little to have clear access to the origin and then right clicked on it. If the axes had been changed, Reset would have been black instead of grayed out. There is some tolerance as in any drawing program. Sort of a close enough thing. Maybe you're running into that.
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@dave r said:
There is some tolerance as in any drawing program. Sort of a close enough thing. Maybe you're running into that.
Maybe. But if that's the case, SU should be fixed by Trimble to properly handle this tolerance. Like not showing the ~ symbol when that's the case. Somehow is reassuring to see that is not so common issue, that means is something that i shouldn't be so concerned for other drawings. But still annoying that i can't figure out why it's happening here.
thanks all for the effort.
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Every drawing program has to have some sort of tolerance setting.
It may not help but I don't see the ~ when I reduce the precision.
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@dave r said:
Every drawing program has to have some sort of tolerance setting.
It may not help but I don't see the ~ when I reduce the precision.
[attachment=0:1r3zxqoz]<!-- ia0 -->Screenshot - 6_13_2015 , 8_52_26 AM.png<!-- ia0 -->[/attachment:1r3zxqoz]That's what i was talking about...reducing precision places that strange symbol "~"
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Do you see ~ in my screen shot anywhere? I don't see it.
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There shouldn't be any issue with creating your geometry without ~ and to accurate dimensions.
Dave already mentioned that (some) faces aren't on axes planes.
At some stage you may have inadvertently moved some geometry slightly off axis.Use the 'Tape Measure' tool > disable the +sign by hitting [Ctrl] once > click on a large face with the tool to fix its starting point > orbit to get the axis color perpendicular to that face > now also hold down [Shift] and see how the values change when measuring locations on that face where they all should read 0.000000
I recreated your geometry next to yours, only relying on SketchUp's inferencing engine and estimated (your model) lengths to input. See attached model.
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Thinking about this reminds me that another member had a similar issue a few years ago. Turned out he had managed to get things off axis somehow. It was only slightly but enough to show in the dimensions.
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So if your object is not orthogonal it cannot have accurate dimensions? Really?
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@pbacot said:
So if your object is not orthogonal it cannot have accurate dimensions? Really?
No, if the geomtery is accurate, the dimensions will be too.
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@pbacot said:
So if your object is not orthogonal it cannot have accurate dimensions? Really?
That is not what I am saying.
But working with some geometry that is slightly off means that you should be extra cautious when expecting to continue collinear or coplanar. The axes may draw new edges on axisOf course it is possible to model 'not orthogonal'.
Also with geometry slightly off axis the 'Dimensiion' tool may indicate the ortoganal dimensions instead of the expected real edge lengths. Here again you can of course get the real edge lengths but SketchUp may trick you without bein noticed.
Thing is that the original model wasn't accurate anymore, maybe due to moving some edges or faces.
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But is interesting how the geometry ended slightly off-axis when all of it was drawn using axis inference.
This was actually my problem... i know how to measure/check things... but I am still confused how can be possible that drawing parallel to axis can result in displaced geometry. And whats even stranger is that turning on ColorByAxis, all edges seemed aligned. -
Don't be bothered by that, Sketchup has its limits. Just be aware of them. The more you get into it the more you will be surprised(in worse)-especially when working with that much precision and small objects.
PS Make the habit of purging your model. There are plenty of components in the model that perhaps you don't want to share with everybody.
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A couple of thoughts:
First, be aware that color by axis also has a built-in tolerance and will accept lines that are slightly askew. As a result, it is not useful for detecting small errors.
Second, (it may not apply to you) on a few occasions when I let go of the mouse to enter a value via the keypad, the mouse drifted slightly off the inference point. The line, while the correct length, was slightly off orientation. This makes the dimension come out with "~".
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This model has many layers and some of those layers contain geometry that is not on the default layer. I wonder if some intersect or other operation could have caused this error?
I've seen some odd things happen when Sketchup automatically fixes errors upon saving as well.Only a thought.
Shep
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