Door handle with texture
This tutorial is going to show the main steps on how to apply the relation to the 3d model. wish it could be helpful.
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Step 1: Create the handle surface

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Step 2: Create a variable helical sweep surface interset with handle surface
Draw a funtion graph.

Sweep a normal radiative surface along the handle center curve.

Type the funtion relation.

Now you get a variable helical radiative sweep surface.

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Step 3: Create the intersect curves
Create the intersect curves between handle surface and sweep surface.

Also connect the end curves.

Complete the curves like this.

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Step 4: Create sweep texture slots
Create slot surface one by one.

Merge all texture slots.

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Step 5: Final step
Solidify the raw handle surface.

Cut the solid handle with textrue surface.
