Hemisphere, Cylinder, and Cone wedge shapes

[desandro]

Currently composite shapes like Hemisphere, Cylinder, and Cone can only be rendered with fully circular bases. There is no easy way to render a quarter-sphere or half-cone.

One solution may be to add a quarters option, similar to Ellipse. For example, quarters: 2 would render a half-cone.

Add a 👍 reaction to this issue if you would like to see this feature added. Do not add +1 comments — They will be deleted.

[NEO97online]

This would be a great feature to have. In the mean time, is there any workaround to make a half-hemisphere? (A quartersphere!)

[theohonohan]

Would it be more flexible to offer wedges of a certain angle, say multiples of 2*pi radians? So a full circle would be 1, a quarter circle would be 0.25, etc.

[csalmeida]

That sounds great! Does anyone know if there's a way of changing how tall an Hemisphere is? Maybe I'm missing something but changing the width or height only makes the base larger (can be seen better if a backface color is set).

[codecodestop]

I realize the most recent question is years old now at the time of my reply, but I have a solution, and since others may have the same question in future, I decided it would not be 100% obnoxious to answer ~5 years later. So I couldn’t resist. :)

Since a hemisphere is nothing more than half a sphere, and a sphere has no sense of height, you might achieve something closer to what you have in mind—assuming that I’ve understood your question, which may be a risky assumption—by using a cylinder. Using the ZDog concept of using extreme ‘stroke’ values to add volume, you could make it taller by just extending the path which defines the cylinder’s dimensions.

[theohonohan]

I don't understand what you are saying. As I understand it, the question was about creating a "hemi-ellipsoid" rather than a hemisphere.

There are two basic kinds of hemi-ellipsoid: oblate (currently supported) and prolate (seemingly not supported?). This isn't standard terminology, but this diagram should make the two possibilities clear: https://www.researchgate.net/figure/Schematic-diagram-of-prolate-and-oblate-ellipsoid-and-their-aspect-ratio_fig1_342297075

On Sat 9 Dec 2023, 13:10 codecodestop, @.***> wrote:

I realize the most recent question is years old now at the time of my reply, but I have a solution, and since others may have the same question in future, I decided it would not be 100% obnoxious to answer ~5 years later. So I couldn’t resist. :)

hemisphere is nothing more than half a sphere, and a sphere has no sense of height, you might achieve something closer to what you have in mind—assuming that I’ve understood your question, which may be a risky assumption—by using a cylinder. Using the ZDog concept of using extreme ‘stroke’ values to add volume, you could make it taller by just extending the path which defines the cylinder’s dimensions.

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