Taper / Bulge
Scales the cross-section radius as a function of height. Taper narrows or widens the top and bottom independently, while Bulge adds a barrel-like swelling in the middle. This is a structural effect — it always applies to both the inner and outer walls.
Parameters
Taper Top- Scale factor at the top of the object (0.1–3). Values below 1 narrow the top; above 1 widen it. At 1.0 the top is unchanged.
Taper Bottom- Scale factor at the bottom of the object (0.1–3). Values below 1 narrow the bottom; above 1 widen it. At 1.0 the bottom is unchanged.
Bulge- Outward bulge at the middle of the object (\u22122 to 2). Positive values swell the middle outward (barrel shape). Negative values pinch the middle inward (hourglass shape). At 0 there is no bulge.
How It Works
For each vertex, the effect computes a radius multiplier based on the normalized height (V coordinate). The taper component interpolates linearly between Taper Bottom (at V = 0) and Taper Top (at V = 1). The bulge component adds a sine-based swell that peaks at the midpoint (V = 0.5) and is zero at the top and bottom.
The vertex XY position is scaled by the combined multiplier, moving it closer to or further from the central axis. Z remains unchanged. Because this affects the overall silhouette, both inner and outer walls always receive this transformation.