Missing Cortex Fields After Downsampling (8003 to 3000 vertices)

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I am currently working on downsampling a cortex surface from 8003 vertices to 3000（maybe3002） vertices using the Brainstorm interface. However, I noticed that after completing the downsampling step, several fields in the cortex structure are missing. Specifically, the following fields are no longer present in the downsampled cortex file:

  • color
  • VertConn
  • VertNormals
  • Curvature
  • SulciMap

I followed these steps:

  1. Right-clicked on the cortex file in the Brainstorm interface.
  2. Selected "less vertices".
  3. Chose to reduce the number of vertices from 8003 to 3000（but it seems to be 3002 automatically，i don't know why）.

The downsampling itself works as expected, but the resulting cortex file lacks the above-mentioned fields. These fields are critical for my analysis, and I would like to know how to preserve them during the downsampling process.

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image1788×768 223 KB

Could you please provide guidance on:

  1. Whether it is possible to retain these fields directly during the downsampling process.
  2. If not, how I can manually recompute or restore them after downsampling.

Thank you very much for your assistance!

2

Are you able to visualize the downsampled surface by double clicking on the file?

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These fields will be computed by Brainstrom once needed,
you can display it first and then check again.