Tutorial on Parametrically Making a Creative Feather Chandelier with Grasshopper

I.  Create chandelier components in Rhino

-1️⃣  Use a curve to create the cross-section of the rod, then use the Revolve command to create the rod model.
-2️⃣  Create the bulb model with a sphere and adjust it to an appropriate size.
-3️⃣  Create the lampshade model with a sphere, adjust it to a suitable size, use F10 to turn on the control points, adjust the point positions to control the shape of the lampshade until satisfied.
-4️⃣  Draw a straight line at the bottom of the lampshade and trim off the lower half of the lampshade.
-5️⃣  Draw a batch of feather planes outside the chandelier model area, as preparation for the feathers covering the feather chandelier. The size can be arbitrary and can be modified later.
-5️⃣  Place a reference point below the feather plane, which will be used as the base point for feather placement.

II.  Position the feathers onto the lampshade model

-1️⃣  Use Brep to get the lampshade model.
-2️⃣  Use the Populate Geometry component to generate positioning points.
-3️⃣  Use the point analysis tool to generate positioning planes (see video for details).
-4️⃣  Randomly adjust the angle of the generated positioning planes, with the angle set between 40° and -40°.
-5️⃣  Use the Orient component to position the feather unit from step 1 onto the lampshade model.

III.  Apply randomness to the feathers positioned on the lampshade

-1️⃣  First, calculate a gradient based on the height of the feathers in space: the higher the feather, the smaller its size.
-2️⃣  Then use a random number algorithm to randomly vary the size of all feathers, making the feathers look more natural and staggered.
-3️⃣  Connect the above parameters to the Scale component.

IV.  Adjust the lampshade parameters until the shape is satisfactory. The following Grasshopper parameters can be adjusted:

-1️⃣  Number of feathers
-2️⃣  Random seed for positioning points
-3️⃣  Feather angle range
-4️⃣  Feather size variation by height
-5️⃣  Overall feather size variation

V.  Bake the feather planes

-1️⃣  Use the bake command to bake Grasshopper objects into Rhino objects.
-2️⃣  Apply feather textures. The texture format must be an image with an alpha channel.
-3️⃣  Apply the feather image to both the color and transparency layers to achieve the feather effect.

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