Solution - Elevations Style inflating PDF file size, resulting in large PDF files

Sabiman5246 — Thu, 25 Jun 2026 14:09:28 GMT

Hello, I've been using this idea for a while, but it's still short of what a solid API update could potentially do. So the main problem with the Elevations Style is that it's vectorizing every triangle in the TIN. If you're doing this with a volume, it's a TIN composed of every vector crossing between every triangle of both tins. If you're working with high resolution TINs such as data derived from LiDAR of photogrammetry, it's exponentially larger to the point where the files are no longer attachable to an email.

Here's my solution:

1. Turn off the toggle that plots the paper space last (NOTE: do not have any linework or text overlapping viewports or the plot order will bug out)

2. Turn off EVERYTHING except for the surface containing the Elevations Style.

3. Plot to JPG. You may have to calculate your sheet size (300 DPI / 25.4 ≈ 11.81 DPMM, 600DPI / 25.4 ≈ 23.62 DPMM)

4. Bring that plot into your Layout as an XREF from corner to corner

5. Turn off the surface

6. Replot

You could take this one step further by:
7. Pushing the image back to model space with CHSPACE

8. Bound the image using your surface boundary
9. Use Send Under Objects to push it behind the surface so it maintains object order.

10. Turn off the Elevations from your style (I would recommend leaving contours on).

This rasterizes the surface, in turn reducing the vector count caused by all those little triangles. Note you will end up with some antialiasing, my solution is to turn the surface into a Contours Style that matches the color banding interval so it masks the transitions between colors with linework.

Re: Solution - Elevations Style inflating PDF file size, resulting in large PDF files

SoaresASBCAD — Thu, 25 Jun 2026 14:36:58 GMT

I think everyone just appreciates you sharing this. Thanks for taking the time to document the workflow—it’s a very practical solution for anyone dealing with large Civil 3D surfaces. Hopefully Autodesk considers implementing a native raster option for elevation analysis in a future API or plotting update.

topic Solution - Elevations Style inflating PDF file size, resulting in large PDF files in Civil 3D Forum

Solution - Elevations Style inflating PDF file size, resulting in large PDF files

Re: Solution - Elevations Style inflating PDF file size, resulting in large PDF files