Explanation please: (p.x*inv_dx-Vec(0.5_f)).cast<int>();

[Schizo]

Hi,

just a quick question, what is base_coord after the following line.

Vector2i base_coord = (p.x*inv_dx-Vec(0.5_f)).cast<int>();

Thanks a lot

[yuanming-hu]

Hi,that's the smallest (lower-left) grid node the particle will touch-Yuanming-------- Original Message --------Subject: [yuanming-hu/taichi_mpm] Explanation please: (p.xinv_dx-Vec(0.5_f)).cast(); (#3)From: Schizo To: yuanming-hu/taichi_mpm CC: Subscribed Hi, just a quick question, what is base_coord after the following line. Vector2i base_coord = (p.xinv_dx-Vec(0.5_f)).cast();

Thanks a lot

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[Schizo]

Sorry, I think your message got screwed, I just wanted to know, what the .cast() exactly does. Is this a static/dynamic cast?

[yuanming-hu]

My original response: that's the smallest (lower-left) grid node the particle will touch. .cast means element-wise convert float to int in the vector, i.e. floor when the elements are positive.

Thanks.

[Schizo]

elementwise, that's what I was looking for. Thanks a lot.

[yuanming-hu]

sounds good!