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Here is a new version. I realized that percentage is a bit misleading. It's a probability rather than a percentage, so I renamed that. While I was at it I also added support for Vertex Maps. You can use that to influence the probability spatially with fields. So if you want some areas of your point cloud to remain more dense and others to become more sparse, you can do that now. Procedural_delete2.c4d

Two other options attached, both avoid UVing. My personal first choice for this situation would be to remodel the shape so c4d's auto UVs would just magically fix everything. I selected the edges along the top of the wall, ran the 'edge to spline' command, then just extrude the spline to remake the wall model. Now it has perfect UVs and the texture will just fit by itself. Another option is to break the model up into easier to texture parts. You have 2 straight bits and 1 curve, so... use 2 straight flat projections with polygon selections and one cylindrical projection for the curve. You will never get them perfect, they will never be perfectly undistorted, but its easy and doesn't require any extra brain power. wallcircles.zip

If you have a version that supports capsules, you can use the attached scene to delete a percentage. Do a current state to object to "bake" your reduction. Procedural_delete.c4d

A point cloud does not hold any topology. This means there is no information at all to differentiate which point to remove and which not. My guess is that the OP wants to thin out th cloud by removing points where there are many, that is an operation that classic modeling functions like Optimize can not deliver.

Please update your profile so we know which version you are working with. Answers sometimes depend on us knowing that. Let's get our terms right before we start - By 'skin tool' you mean 'Loft'. However the loft generator ONLY accepts splines as inputs so what you are doing in that file is incorrect because your extrusion object is a polygon mesh, not a spline. So first thing is to get the spline that made that star and that text, and use them directly in the Loft. However, big problem: The text is multi segment spline, and the star is not, and that, I am afraid, is going to ruin this plan completely. So, no, this cannot be done, or at least not using that method. CBR