how can i make in blender geo nodes the bezier curve only subdivide inbetween the top 2 vertices and the bottom ones, while the one vertice in the middle is unsubdivided?
Appreciate any reply
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$\begingroup$ May I suggest to remove unrelated tags ? And perhaps add [bezier-curves] ? $\endgroup$– StefLAncienCommented Mar 28 at 21:11
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1 Answer
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(Using Blender 3.6.8)
With Trim Curve nodes, the Bezier curve is split in 3 splines using the Factor parameter to define the endpoint positions.
Start: (see top branch of the following graph) The position of the second control point (i.e. with Index equal to 1) is recovered with a Sample Index node set in Point domain. Then the spline made of the first and second control points is subdivided once.
End: (see bottom branch of the following graph) The index of the before last control point is computed from the Point Count returned by a Domain Size node set in Curve domain, by subtracting 2 (because Index starts at 0). Once its position is recovered, the spline made of the before last control point and of the last control point is subdivided.
In between both: (see central branch of the following graph) The spline made of all control points between the second one and the before last one (included) is unmodified.
Resources: 
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$\begingroup$ Thank you for your reply. Is there a method to procedurally adjust the vertex concentration along the bezier curve when extruding bezier vertices, allowing for a repetitive pattern to be visible on the curve? Additionally, is it possible to scale and shape the cubes using the point on instance node? $\endgroup$– Murat GCommented Mar 29 at 21:42
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$\begingroup$ About the first question on extruding Bezier vertices, I would recommend to post it as an other question, as it is quite complex because a curve made by GN can not be edited as a curve afterwards. Add explicit pictures of what you would like. $\endgroup$ Commented Mar 30 at 8:44
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$\begingroup$ About the second question, could you detail what you mean by "scaling and shaping" the cubes ? As instances, these can be rotated and scaled, but not reshaped individually. Perhaps an other post will be more suited again. $\endgroup$ Commented Mar 30 at 8:46