12 Oct
0

three.js:version:0.121 when I run this code,

new THREE.ParametricGeometry( func, 200, 10)

var func(u, v, point){
console.log(u,v)
}

result:

0 0
0.00001 0
0 0.00001
0.005 0
0.0049900000000000005 0
0.005 0.00001
0.01 0
0.00999 0
0.01 0.00001
0.015 0
0.01499 0
0.015 0.00001
0.02 0
0.01999 0
0.02 0.00001
0.025 0
...

it look like a bad slice

when i run the similar code in version:0.74

new THREE.ParametricGeometry( func, 200, 10)

var func(u, v){
console.log(u,v)
}

0 0
0.005 0
0.01 0
0.015 0
0.02 0
0.025 0
0.03 0
0.035 0
0.04 0
0.045 0
0.05 0
0.055 0
0.06 0
0.065 0
···

So why this happen, the 0.121 version cannot show the result well?

Answer

The additional calls of the parametric function were introduced with r85 in order to fix a normal computation bug. You can read more about this in the following PR: https://github.com/mrdoob/three.js/pull/11056

Apart from the normal data, other vertex information are not affected by this fix.