Trimmed parametric surface in Blender Geometry Nodes vs Rhino Grasshopper 

Hi! I would say both. Rhino is Nurbs and has Grasshopper, excellent documentation capabilities, and works well with Revit. However, it is too precise for early conceptual work and even though it uses Cycles, the implementation is not as good for rendering as in Blender. Blender, has excellent inherent parametric modeling capabilities that allow you to be as fast and precise or imprecise as you would like to be to get the ideas flowing. Blender also fits conveniently in between the explicit and completely non-parametric modeling in Rhino, and the completely parametric, but sometimes it-just-takes-too-damn-long-to-construct in Grasshopper. And of course you can render really well with Cycles inside of Blender. But Blender's documentation capabilities come from addons like BlenderBIM and MeasureIt Arch, which are themselves in early development Sorry, not a short and sweet response, but if you have any more questions shoot them :)

Maybe that should be a video to talk about when and what each is useful for? 🤔

@@UHStudio i would really love to see the process 'after' the blender phase. Like how do you convert these conceptual meshes into a parameteic model, then into the documentation phase

Thanks, and let me know how your learning journey goes

@@UHStudio Sure! Definitely I will !

Coming from GH to GN was indeed a struggle for simple things like that! They are adding more data-based parsing but no where as much nodes as in GH or Sverchok. Having said that, the mentality of working with it needs to be a bit different than GH. For example, in GN, instancing on points and then modifying the result with set position is different than in GH where first we set out the points in the correct order and data format and draw curves or whatever else on top of them. So for something like graft, in the most typical base case scenario of points aloing the U and V of a surface where you want to create curves based on points in the perpendicular direction in GH, in GN you would simply add a mesh line and instance the perpendicular geometry on the points.

Do you mean like taking a flat object and apllying it onto a surface? That's essentially a tessellation. Take a look at my videos on the Tissue Addon, as it does precisely this.

There are also node groups that do tessellations in geometry Nodes. However, quite a few of them are paid, like the Erindale Toolkit.

Sorry, I don't understand your question

@@UHStudio If the bottom curve is split into 2 parts your nodes ignore the second half. Imagine 2 sections of roof joining. Or fingers joining the palm of a hand. How do I make this work - so the node setup sees both parts of the bottom curve and joins both correctly to the top curve. Thanks for the attention...

@@neilmarshall5087 for two separate bottom curves and one top curve, you would either have to separate the top curve and perform the operation twice or combine the bottom curves into one curve. But if there are sharp corners, the perpendicular curves will be hard to control, so better split the 2nd curve

@@UHStudio OK. I will be looking at the Sample Curve Node after watching Erindales latest video. That seems to offer a solution.

Hi. No, but close - Bulgarian

I asked because your last name is similar to Russian.Okay I'll think about it🎉