Hi everybody!

I'm trying to draw a bullet. For this, i need 2 pieces: the bullet body and the ogive. I know how to plot the cylinder for the bullet body but I struggle to plot the ogive with the corresponding radius…

I am using this relation for a 3D parabolic ogive:

*

- found on Wikipedia : https://en.wikipedia.org/wiki/Nose_cone_design

Here's my code:

`x = 0:1:10;K = 0.75; d = 5; R = d/2; % radius - same as the radius of the bullet body`

Lo = 10; % ogive length

% parabolic ogive equation

y=R*((2*(x/Lo)-K*(x/Lo).^2)/(2-K));% 3D representation

[X,Y,Z] = cylinder(y);X=X*R/2;Y=Y*R/2;Z=Z*Lo;surf(X,Y,Z);axis equal;

the result:

The problem is I don't think the code is right and the result neither. In fact the diameter of the circle is more than 5 and I don't know why. Can you help me understand this cylinder function ? Thanks ðŸ™‚

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