Stokes on a curved surface

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sycohead
Posts: 5
Joined: Fri Feb 24, 2012 8:21 pm

Stokes on a curved surface

Post by sycohead » Thu May 17, 2012 7:10 pm

Does anyone know how to make strokes dissappear on a drawn curved surface? (using the draw tool only + soften edges)
I have tried hiding the lines on the smoth/curve surface but they strokes still show up when rendered.

truly stumped,
Steve

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AdamB
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Joined: Wed Apr 16, 2008 10:11 am
Location: Brighton, UK
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Re: Stokes on a curved surface

Post by AdamB » Fri May 18, 2012 7:49 am

Hi Steve,

LightUp uses a test to decide which edges to stroke. The edge must be an 'exterior' edge (making up the boundary of a face) AND planar with the face.

In plain English that means if an edge between 2 faces is on a curve, it should not be drawn.

Be aware SketchUp has a 'feature' whereby un-Grouped / un-Component geometry is drawn smooth shaded by SketchUp but the underlying geometry is actually faceted. Only Grouped/Component geometry has smoothed normals - though SketchUp draws Grouped and Ungrouped the same!

You can confirm this by draw a cylinder and check in Tourtool and you'll get facets. Group it and you'll get smoothed normals.

So, if you are getting edges stroked on curved geometry, check its in a Group.

Adam
Developer of LightUp http://www.light-up.co.uk

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