Fix sampling ratio to make the 'stride' value valid in gl.VertexAttribIPointer calls

[f-fl0]

I ran into the following warning when setting num_fast_render_points to 1000000 with a point cloud containing about 24 millions points:

In this case, the point cloud completely disappears when moving the viewpoint. This PR makes sure samplingRatio is adjusted to prevent the stride value to be over 255 in gl.VertexAttribIPointer calls.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.16%. Comparing base (97c5aa6) to head (df33469).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #261   +/-   ##
=======================================
  Coverage   38.16%   38.16%           
=======================================
  Files           8        8           
  Lines        1643     1643           
=======================================
  Hits          627      627           
  Misses        980      980           
  Partials       36       36           

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[at-wat]

LGTM