Can we make 2 surfaces in ring model becomes 1 surface?

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please help me with , i want to make red and blue two surfaces become 1 surface only, thanks :slight_smile:
I just want to make all the entire blue and red part surface join become single surface , thanks

The red and blue surfaces cannot be merged into a single surface. Surfaces can only be merged along untrimmed edges. The edge of the red surface which coincides with the blue surface is a trimmed edge.

If a trimmed edge is an isocurve (usually the result of use Split with an isocurve as the splitting object) then ShrinkTrimmedSrf will shrink the surface so that the edge is not an isocurve. But that is not the situation for the red surface.

If you need a single surface you will need to recreate the model with a single surface.

is that a way to make entire blue and red part become 1 single surface ?
because I also want down shank part also with smooth surface,
how to create this signet model , because I try to make all the surface full of diamond , hmmm

Two options for a single surface with the shape of the combined red and blue surfaces.

  1. Start over and create a new single surface with the desired shape.

  2. Untrim the red surface and deform the red surface until the shape is a “close enough” match to the shape of the blue surface. This is not easy, may require adding knots/control points, and the result may not be satisfactory. I’ll follow with a post about one way of deforming the surface.

A comment about the red surface. It is very “heavy” with many control points. It is very difficult to edit or modify such a surface and keep it smooth.

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One method for deforming the untrimmed red surface to approximately the shape of the trimmed red and blue surfaces. This method uses the Patch command, the untrimmed red surface as the start surface, and the render meshes of the trimmed red and blue surfaces as the target.

ExtractRender the render meshes of the trimmed red and blue surfaces. Create a new layer and move the render meshes to the new layer.

Copy the red surface to a new layer. Untrim the hole in the copied surface.

Start the Patch command. Select the two render meshes as the objects to fit the surface through.

Click on “Select Starting Surface” on the panel which opens. Select the untrimmed version of the red surface. Make sure “Preserve edges” is selected and “Automatic trim” is not selected.

Complete the Patch command.

Project the edge of the green surface onto the new surface. Trim the hole in the new surface.

Use PointDeviation to check how close the new surface fits the original red and blue surfaces.
Use Zebra or EMap to check the smoothness.

Experiment with Starting surface pull values if the results are unsatisfactory. Also exeriment with adding knots/control points into the untrimmed starting surface using InsertKnot if the results are not close enough to the original surfaces. Be aware that adding knots/control points may cause waviness in the result of Patch.
ask polysurfaces DC01.3dm (539.5 KB)


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OMG, hahaha, crying outloud, exploding my mind, thanks I am studying this step by step,