Intersection does not work

[newnoob]

Hi guys!

I have the problem that a face does not intersect with a an other object.

The face and the object have a certain amount of coplanar areas all located at an inclined plane where the should intersect but the do not.

I explodet both, selected both and tried several intersections methods but non of them works.

Could someone who has more clue than me have a look at my model and maybe tell me why?

link to the model:

https://drive.google.com/file/d/0B_0-KRhOFHwIazlRQlduTTEwRUU/edit?usp=sharing

Thank you very much!

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[Rich O Brien]

Try scaling the model up by 100x

Intersect and then scale back by 0.01

[newnoob]

I've already tried that before (even scaled it up by 1000)I tried it now again but it does not work, pretty strange.

I've just mentioned that the link in my first post lead to the wrong model, I've rectified that now.

[slbaumgartner]

I'm not completely sure I understand what you are trying to do, but here's a stab:

How did you originally chop off the bottom of the complex shape? From some playing with your model, it appears to me that the bottom edge may not be perfectly planar. If you reveal hidden lines, zoom in, and roam around, you find strange looking things like these:

I think the intersect is generating Edges where bottom Edge segments of the shape lie in the plane, but leaving gaps where they do not, and as a result the intersections do not form closed shapes the way you expected.

HTH
Steve

PS: those sorts of tiny missing triangles are typical of what happens if you do many kinds of operations without first scaling up the model enough. SketchUp does not draw Edges when it thinks their Vertices are too close together, and that causes jagged edges and missing Faces.