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Have You Run Into the Clipping Plane?comments (3) May 16th, 2011 in blogs
In this case, I'm not referring to a particular shop hand plane, rather a phenomenon in SketchUp. You can run into a Clipping Plane when zooming in very closely to your model. All of a sudden the model explodes with a bunch of splinters and jagged pieces. It can be scary, as you wonder what happened to all of your modeling work. Thankfully, all is OK - as you zoom out the model recovers without damage.
Recently, I've been working on a Philadelphia Lowboy that includes quite a bit of complex intersections and curves. See picture below. Although working to avoid graphics anomalies (holes, gaps, missing faces, and distortions), nevertheless these things can show up when doing Intersections or Follow Me's on small curvatures. Scaling up by factors of 10 or even 100 helps, but I can still find problems although miniscule.
In trying to repair these problems, I'm forced to zoom very closely to the model, and that is when I run into the Clipping Plane. It won't allow me to get close enough to the problem. It's frustrating, but fortunately, there is an easy remedy.
I will use this corner of the Lowboy top as an example. This shaped edge was done with Follow Me but some very small anomalies are there, albeit very small.
When zooming in closely to view and fix these problems, the Clipping Plane explosion occurs as shown below.
To remove this issue, go to the Menu Bar and click on Camera. You will see the list as shown below. Click on Field of View. The normal setting for this parameter is 35 degrees. Type 2 to change this to 2 degrees (almost parallel projection). Immediately your clipping plane should disappear, and you should have a very good close-up view of the model.
Now I can see the small anomalies where faces are missing.
I turn on Hidden Geometry which you will find in the View Menu. There are three missing faces, two small triangles and a flat face above (you can see through the hole to the inside face of the base of the Top).
Now I can really get close and by using the Line Tool, I'm able to repair the hole and close in the faces.
Here's a closeup of the upper hole. Again with the Line Tool, I can trace over one of the edges of the hole, and the face closes in.
After the repairs, I zoom out. The Hidden Geometry is still "On", but the repairs are intact.
Go to the View tab and in the pop-up menu, click on Hidden Geometry to remove the checkmark.
This looks good.
Here is the view of the model in 2 degree perspective. It looks funny and much like it would look in Parallel Projection.
You can also avoid the Clipping Plane by switching to Camera/Parallel Projection. It works but I find that using the Field of View is quicker and easier. When using Parallel Projection, I find that I have to re-orient the model and zoom in again.
posted in: blogs
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