The toolkit that SketchUp uses for its Windows UI supports only a subset of SVG:
- no gradients (ouch!)
- no filters (for smooth shadows)
- no embedded images (as work-around for the previous limitations)
- and no clip paths
By comparison, different PDF standard versions (PDF/A-1 1.4 vs. Adobe’s non-standard PDF) have also varying limitations compared to SVG. As a work-around, you could:
- emulate the missing features (posterizing gradients to layered polygons of varying color, intersecting polygons instead of clip paths, embedding raster graphics; some of these can be done with extensions in the SVG editor)
- render the vector graphic to a raster graphic
- simplify the design to work with less SVG features (flat design instead of gradients etc.)