Faces just triangulate themselves.
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I've been seeing it happen with good geometry after hitting intersect with model. triangulating. I hit undo and it's back to good again.
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Auto folding?:
Can you post yor model? -
Is this very small geometry? Did you try to scale it up? You can try the "Merge faces" option of Thomthoms Cleanup (after scaling) to erase those lines if the faces are coplanar...
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@cotty said:
Is this very small geometry? Did you try to scale it up? You can try the "Merge faces" option of Thomthoms Cleanup (after scaling) to erase those lines if the faces are coplanar...
There was no scaling. I will tried the cleanup; it didn't succeed.
Here's the model (just a small part of it though because the whole thing is currently 19Mb)
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Note the top and bottom surfaces are very different, the top has a number of stray lines(~31),use the text tool to check the location of vertiecs and you see you get the sense the surface is distrorted, change the model units and remove the two place meter and use something that gives more resolution so you can see what is going on ( like 3 placs mm. So now the question is how to correct without a lots of work. luckly the supports are components so you will not have to redraw them.
I have to convert your model to SU8 before i can go further. -
Attached is quick look.
Used outliner, selected all the support components, moved them up above surfaces.
Deleted the surfaces you posted and drew new bottom one, moved supports back then drew second surface.
I also removed you materials, did purge and fix problems. For those condiditions model size is ~40kb no auto folds.
When doing intersect some componts intersect with surface others do not even though all the same componets which i do not understand yet?
I have some thoughts why you had the orginal problem most probable is you slightly moved a vertices causing the auto fold but dimensional checks does not confirm that.
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Sorry for late answer, was very busy in uni.
I don't really get what happened, sometimes a single plane auto-folds. I do play with axis a lot in order to speed up my modeling; I wonder if this has an effect. It is really strange.
Thanks for helping me; the holes disappeared, so I will have to re-cut them. Perhaps it has something to do with the complexity of the geometry?
Re-cutting this will take ages; I think that the smoothing in sketchup may be screwing up the model.
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You cannot use the orginal model you posted? I have done a number of dimensional checks and can not find any smoking gun but in some cases the intersections do not happen the way I think it should. Do you need the supports to be hollow? Trying to put top /bottom surface could help?
This tut gives info on the intersections http://sketchucation.com/resources/tutorials/37-beginner/433-the-basics-of-intersection-in-sketchup.
Removing unneeded materials wwould help on reducing model size.Actually the model is realitive simple and should not be ~20MB -
Attached is correction to your model , or rather the lower surface. Both top and bottom showed the same problem so I assumed fix for one would be good for the other;
1.A new component for #94 ( I called support ) was made to correct some small dimensional inconsistencies;
2. Out-liner was used to select #94's, move them up off the surface and the component browser “replace selected “was used to replace them with the new support;
3.The supports were cut and pasted in place to move them to separate context;
4.The rendering was changed to wireframe and then hidden resulting in a clean window with no geometry;
5. Ctrl+ A was used to select , then delete to remove any extraneous entities in the model Note; this render mode when hidden is not selectable by SU ,so they were unhidden.;
6.A new surface( problems corrected here also) was drawn on the ground plane and a plugin called “smart drop” used to place them back on the surface and an intersection done with no auto fold this time;
7.A left to right selection was done selecting both intersection edges and faces ( don't select the total surface);
8.Thomthom's selection toys was used to deselect the edges allowing all the faces in the intersection to be easily deleted.
You need to change the units you use. A 32 bit float which SU uses has a 7+ bit percision and using 2 place meter does not show thw resoloution you need
Good Luck
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just looks like faces are not coplanar to me.
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The problem of coplanar faces must have happened when you changed axis? What is the method you use for doing that? 3 point? If so try other method:
1 - right mouse button on chosen face;
2 - align axes.That way you are always working coplanar to chosen face.
You should be careful when working with axis. I suppose you use groups for organizing your model... If you do that you can define an axis for each group/component wich will let you work with predefined axis without being always changing axis.
Hope that helps,
JQL
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There are about 140 instances of the same component and setting the axis and inetrsection each seperately will take to much time. There are a number of problems in the model, the component definition dimension and the instance's are not consistenet to mention a few including heigth. These contribute to the auto fold one sees and if the model is corrected you will not run into that problem.
I have no info to determine what caused all the issues but would suggest to the OP; They spend some time watching the videos on the use of the inference engine; use the projection plugin to establish the plane intersections, Thomthom's selection plugin so a batch selection and deletion of the faces can be done, and make sure the intersections are done in the correct edit context of the entities.massivetriangles_SU8_11_11B.skp -
Does someone have a solution to this now....
I have been looking for a answer to this problem also, the thing is I know my faces are co-planar because after it happens i can turn on hidden lines and delete the triangulations without losing my surface.
Triangulation does occur from the intersect faces command as mentioned above however in some situations if I try to create an opening in a surface by drawing on the face with a rectangle or lines (my usual preferred method) then it does not cut any hole and also creates more faces across the entire surface (usually 2 extra surfaces on top of the original) in the same plane.
My firm recently moved to 2013 from SU7 and it is definitely has more bugs and issues while being slower to run in general.
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