Intersect/Match causes segmented surface become curved surface

asked 2015-10-22 16:22:51 -0600

updated 2015-10-22 17:44:29 -0600

All;

This is similar to the question just posted about "Intersect/Match causes unnecessary surface fractioning". But in this case I have a curved surface which was segmented into a series of straight surfaces. After running intersect these have been changed into a single curved surface. It is not restricted to inside/outside surface types. This highly concerning for 2 reasons: 1. This is an oval building with tons of these surface. 2. This is being done to feed into CBECC-com for the detailed geometry approach, and I am unsure that CBECC-com can handle this change. I used the feature within the sketchup plugin to do the intersections & surface matching. Any thoughts? Thanks in advance - DA.

EDIT: Added screenshots: Project Data

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Before Intersect:

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After Intersect:

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Do you get the same result using the measure than David linked to in his answer, instead of the plugin intersect/match function?

ericringold ( 2015-10-22 16:43:53 -0600 )edit

I've been reading and trying to fully understand that response since they're in the same 'area' of issue. One issue I am/have had difficult is understand what measure can/should be run in the sketchup plugin verses in the OpenStudio software itself.

dradair ( 2015-10-22 17:02:04 -0600 )edit

I am going to save my model off and try doing the intersect/match in OpenStudio and see what happens. I still have to smash my floors all together...[exploded them out while drawing for clarity]. so it may take a big. This is a huge model. EDIT: and will require some extensive rework, b/c apparently all my subsurfaces have been orphaned.....going back several backups...

dradair ( 2015-10-22 17:03:09 -0600 )edit

As you go through this some screenshots may help. I'm not sure how you end up with a single curved surface when you started with a faceted surface. EnergyPlus and OpenStudio, and really even SketchUp don't support true curves. Keep in mind if you have a highly faced surface for a roof then you will also have that many wall surfaces. This will impact the complexity of your modeling process and the time simulations take to run.

Also a rough number of spaces and surfaces would be good to know. The Geometry section of the inspector or the statistics in the model info window can provide this.

David Goldwasser ( 2015-10-22 17:24:41 -0600 )edit

Added some screen shots of project data and before/after intersect in question above. I have NOT run the match surfaces. MY current thought is to smash the model's floors all together in sketchup, then run the intersect/match surfaces in OpenStudio and see if this yields better outcomes.

dradair ( 2015-10-22 17:47:34 -0600 )edit

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answered 2015-10-23 00:01:33 -0600

David Goldwasser

20395 ●94 ●14 http://www.openstudio.net/

updated 2015-10-23 00:05:53 -0600

I wonder if you have Soften/Smooth Edges turned on to a non-zero value. If that doesn't do anything try turning gone "View Hidden Geometry" in the "View" menu and see if a dotted line shows up where the lines are missing. It should also then let you select the individual surfaces.

I don't think anything is wrong with the OSM surfaces when you have it softened, you just can't select them when that happens. What I see if I select in the OpenStudio inspector if a smoothed surface selected is the space, vs. one of the surfaces. Showing hidden geometry or turning of smoothing solves the selection issue.

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This is with softening turned on. Notice how inspector shows space instead of surface.

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Same model with softening turned off. Inspector now shows surface.

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I'll have to watch for that behavior. I can't get the model I did the intersect&match in sketchup to open. But, I had saved it off before running that script; lesson learned from before. Will try intersect&match in OS and see how it pans out. But good info on the behavior to watch for

dradair ( 2015-10-23 10:21:11 -0600 )edit

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