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Question by davidrochin · Jan 17, 2018 at 12:37 AM · collisionraycastmathpositioningspherecast

Lay a Sphere on a Point

I am making a fantasy soccer game with custom ball physics and I have this problem.


alt text


I dont know how to achieve the desired result. Maybe something related to equations?

sphereproblem.png (12.5 kB)
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Answer by Buckslice · Jan 17, 2018 at 12:46 AM

Move the sphere in the direction of the spherecast by an amount equal to the RaycastHit.distance

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Answer by canis · Jan 17, 2018 at 11:11 AM

@DavidRochin I suggest you take a look the Physics.SphereCast it's exactly what you want to achieve on picture (3), even the edge & distance or here is my raycast plugin to help you visualize how the raycast work. Raycast Gizmos Visualizer https://youtu.be/MFLAn25ca9A

SphereCast's distance are calculated to ignore the radius, so just use that RaycastHit.distance as result.

  • assume that "Ball" model have perfect center point.

  • assume the model radius are equal to SphereCast radius.

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Answer by Veltcrows · Jan 17, 2018 at 02:34 PM

Try this:

 ball.position = hit.point + (ball.position - hit.point) * ball_radius; 

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avatar image davidrochin · Jan 18, 2018 at 07:53 PM 0
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Already tried that. The problem with that method is that it moves the ball from its X and Z position when it should not because that is controlled by another parameter.

It causes weird movement, it looks like the ball sticks to the edge ins$$anonymous$$d of just "laying" on it.

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