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Add 'fraying' effect on spiral

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This commit is contained in:
Chris Hodapp 2021-01-24 00:11:42 -05:00
parent 5bee3c8aa3
commit 3ce441d86a
1 changed files with 9 additions and 7 deletions
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16
src/examples.rs
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@ -2,7 +2,7 @@ use std::f32::consts::{FRAC_PI_2, FRAC_PI_3, PI};
use std::f32;
use nalgebra::*;
//use rand::Rng;
use rand::Rng;
use crate::util;
use crate::util::VecExt;
@ -374,7 +374,6 @@ pub struct NestedSpiral {
faces: Vec<usize>,
seeds: Vec<Vec<Transform>>,
incr: Vec<Transform>,
max_count: usize,
}
impl NestedSpiral {
@ -433,13 +432,12 @@ impl NestedSpiral {
faces: vec![],
incr: incr,
seeds: seeds,
max_count: 500,
}
}
pub fn iter(&mut self, idx: usize, b: [usize; 4], xforms: &Vec<Transform>) {
pub fn iter(&mut self, count: usize, b: [usize; 4], xforms: &Vec<Transform>) {
if idx >= self.max_count {
if count <= 0 {
self.faces.extend_from_slice(&[b[0], b[2], b[1], b[0], b[3], b[2]]);
return;
}
@ -458,12 +456,13 @@ impl NestedSpiral {
.map(|(m,incr)| ((*incr) * (*m)))
.collect();
self.iter(idx + 1, [n0, n0 + 1, n0 + 2, n0 + 3], &xforms_next);
self.iter(count - 1, [n0, n0 + 1, n0 + 2, n0 + 3], &xforms_next);
}
pub fn run(mut self) -> Mesh {
let seeds = self.seeds.clone();
let mut rng = rand::thread_rng();
for seed in seeds {
let global = seed.iter().fold(id(), |acc, m| acc * (*m));
@ -471,7 +470,10 @@ impl NestedSpiral {
let (n0, _) = self.verts.append_indexed(g);
self.faces.extend_from_slice(&[n0, n0+1, n0+2, n0, n0+2, n0+3]);
self.iter(0, [n0, n0 + 1, n0 + 2, n0 + 3], &seed);
let count: usize = rng.gen_range(100, 500);
// Old effect: just set count to 500
self.iter(count, [n0, n0 + 1, n0 + 2, n0 + 3], &seed);
}
return Mesh {