# bezierDetail() doesn't work in bezierVertex()
**URL:** https://discourse.processing.org/t/bezierdetail-doesnt-work-in-beziervertex/44173
**Category:** p5.js
**Created:** [March 29, 2024, 8:10am UTC](https://discourse.processing.org/t/bezierdetail-doesnt-work-in-beziervertex/44173 "2024-03-29T08:10:40Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@unfootbird](https://discourse.processing.org/u/unfootbird)
#### Post date: [March 29, 2024, 8:10am UTC](https://discourse.processing.org/t/bezierdetail-doesnt-work-in-beziervertex/44173/1 "2024-03-29T08:10:40Z")
When I was exploring bezier curves. I realized that these two lines of code:
detail = 2 \* int(map(mouseY, 0, height, 1, division \* 5));
bezierDetail(detail);
works perfectly when I define bezier curve through bezier() function but not work within bezierVertext(), anyone have any idea?
---
### Author:  [@Chrisir](https://discourse.processing.org/u/Chrisir)
#### Post date: [March 29, 2024, 1:07pm UTC](https://discourse.processing.org/t/bezierdetail-doesnt-work-in-beziervertex/44173/2 "2024-03-29T13:07:50Z")
please note: This function is only useful when using the **P2D** or **P3D** renderer; the default (JAVA2D) renderer does not use this information.
Otherwise, I don’t know why you have this.
Maybe curveVertex doesn’t use bezierVertex
---
### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [March 29, 2024, 8:15pm UTC](https://discourse.processing.org/t/bezierdetail-doesnt-work-in-beziervertex/44173/3 "2024-03-29T20:15:55Z")
Hello @unfootbird,
> [@unfootbird](#):
>
> works perfectly when I define bezier curve through bezier() function but not work within bezierVertext(), anyone have any idea?
No idea! I would have to explore source code but not inclined to do so.
I explored this with examples below.
`bezierDetail()` in Processing Java works with `bezier()` and `bezierVertex()`:
```auto
void setup() {
size(400, 400, P2D);
}
void draw()
{
background(220);
//translate(-width/2, -height/2);
strokeWeight(2);
int detail = 2* (int)(map(mouseY, 0, height, 1, 20));
bezierDetail(detail);
println(detail);
noFill();
beginShape();
//bezierDetail(detail); // Just testing!
vertex(30, 20);
bezierVertex(580, 200, 180, 175, 130, 175);
endShape();
translate(0, height/2);
bezier(30, 20, 580, 200, 180, 175, 130, 175);
}
```
`bezierDetail()` in P5.js works with `bezier()` but does not work with `bezierVertex()`:
```auto
function setup() {
createCanvas(400, 400, WEBGL);
}
function draw()
{
background(220);
translate(-width/2, -height/2);
let detail = 2 * (int)(map(mouseY, 0, height, 1, 20));
bezierDetail(detail);
console.log(detail);
noFill();
beginShape();
//bezierDetail(detail); // Just testing!
vertex(30, 20);
bezierVertex(580, 200, 180, 175, 130, 175);
endShape();
translate(0, height/2);
bezier(30, 20, 580, 200, 180, 175, 130, 175);
}
```
Processing Java references:
_[Reference / Processing.org](https://processing.org/reference)_
P5.js references:
_[reference | p5.js](https://p5js.org/reference/)_
`:)`
---
### Author:  [@jafal](https://discourse.processing.org/u/jafal)
#### Post date: [March 29, 2024, 9:32pm UTC](https://discourse.processing.org/t/bezierdetail-doesnt-work-in-beziervertex/44173/4 "2024-03-29T21:32:33Z")
## bezierDetail()
Note, This function is only useful when using the WEBGL renderer as the default canvas renderer does not use this information.
> **[Reference](https://p5js.org/reference/#/p5/bezierDetail)**
>
> Find easy explanations for every piece of p5.js code.
---
### Author:  [@unfootbird](https://discourse.processing.org/u/unfootbird)
#### Post date: [March 30, 2024, 3:26am UTC](https://discourse.processing.org/t/bezierdetail-doesnt-work-in-beziervertex/44173/5 "2024-03-30T03:26:50Z")
I did similar work as you did, bezierDetail() did nothing within the scope of beginShape() and endShape()