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A common frustration for many 3D CAD users is the issue of primitives that are swept through 3 dimensions are being twisted. This
is common to most CAD packages. For simple helical paths, work-arounds within MicroGDS can be effective. Unfortunately, for more complex swept paths an alternative solution is needed. This is not a tutorial on how to create a spiral stair, so we’ll start with a drawing which has a suitable path set up. You can use your own drawing or download a copy of mine. In this drawing a basic spiral staircase has been modelled (in red) to give the handrail context. A complex handrail path (in blue) has been set up. The complexity comes from the route around the quarter landing at half height, and also running around the top landing. There is also a slight downward curve at the bottom of the handrail. For simplicity when exporting data, the path object is placed on a separate layer to the staircase. Select the Sketchup Line tool and redraw the line just erased. The endpoints will highlight to show that you are snapping correctly. In this view style, the face colour indicates the direction it is facing. White (or shades of grey) indicate that you are looking at the front (outer) face. Light blue indicates that you are looking at the inner face.
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Tags : spiral staircase, downward curve, quarter landing, spiral stair, shades of grey, suitable path, google, path object, inner face, outer face, cad packages, face light, alternative solution, line tool, endpoints
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