Geometry rotation and traslation

Geometry and Materials
1

Hi,
I’m trying to rotate a cylinder. Reading some answers I understood that when rotating around the origin the best thing is to define the cylinder at the origin, rotate it and then translate it. I just don’t understand how to do it? I’ll give you an example of how I tried to do it.

Thanks in advance

Rotation.inp (1.0 KB)

2

Hi Andrea,

Please have a look at this lecture:

Cheers,
David

3

Thank you.
If I translate and rotate a volume, do I also have to carry out the same transformations for the userbin score or does this automatically give me the result for the rotated and translated volume?

4

Dear Andrea,

The USRBIN scorings are independent of the geometry (except the Region based ones).

If you want to match the axes of the scoring with the rotated body (e.g. a cylindrical scoring on a cylinder with non-z axis), then you need to rotate the scoring.
However, if the scoring doesn’t need to match exactly the geometry (like a fluence map), then it is not necessary.

Cheers,
David

5

So if I have rotated, for example, a cube and I want to calculate the dose using the region mode, I must also rotate the USRBIN score, right?

6

Dear Andrea,

No. The region-based USRBIN scoring doesn’t have a coordinate system, it will aways score in the specific regions, whether they are rotated or not.

Cheers,
David

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