# Hello, I am facing the problem with shadow stripes on model
**URL:** https://discourse.threejs.org/t/hello-i-am-facing-the-problem-with-shadow-stripes-on-model/18065
**Category:** Questions
**Tags:** shadows
**Created:** [August 22, 2020, 8:30am UTC](https://discourse.threejs.org/t/hello-i-am-facing-the-problem-with-shadow-stripes-on-model/18065 "2020-08-22T08:30:03Z")
**Posts on this page:** 11
**Page:** 1
### Author:  [@harshil\_poly9](https://discourse.threejs.org/u/harshil_poly9)
#### Post date: [August 22, 2020, 8:30am UTC](https://discourse.threejs.org/t/hello-i-am-facing-the-problem-with-shadow-stripes-on-model/18065/1 "2020-08-22T08:30:03Z")
Materials : PBR based MeshStandardMaterial.
Lights used : hemisphier light, ambientLight, DirectionalLight
Directional light is used to display the shadow. Direction light’s position set to (0, 200, 50) and bias is set to -0.002
Problem: Some angles, black lines are visible on product, which is facing to the light.
Please find below jsfiddle for a demo. Can you help me to remove the shadow stipes?
[https://jsfiddle.net/7a6gwjyn/](https://jsfiddle.net/7a6gwjyn/)
---
### Author:  [@seanwasere](https://discourse.threejs.org/u/seanwasere)
#### Post date: [August 22, 2020, 10:11am UTC](https://discourse.threejs.org/t/hello-i-am-facing-the-problem-with-shadow-stripes-on-model/18065/2 "2020-08-22T10:11:08Z")
If I turn of castshadow and recieveshadow, I still see the lines. I think that is caused by a texture in your model.
If I change your material by replacing it with a MeshNormalMaterial, then I no longer see the lines.
```
for (let i = 0; i < childrens.length; i++) {
childrens[i].castShadow = true;
childrens[i].receiveShadow = true;
childrens[i].material = new THREE.MeshNormalMaterial()
}
```
---
### Author:  [@harshil\_poly9](https://discourse.threejs.org/u/harshil_poly9)
#### Post date: [August 22, 2020, 10:38am UTC](https://discourse.threejs.org/t/hello-i-am-facing-the-problem-with-shadow-stripes-on-model/18065/3 "2020-08-22T10:38:03Z")
@seanwasere
i have to use MeshStandardMaterial along with PBR flow, so would please try with MeshStandardMaterial only ?
---
### Author:  [@seanwasere](https://discourse.threejs.org/u/seanwasere)
#### Post date: [August 22, 2020, 10:41am UTC](https://discourse.threejs.org/t/hello-i-am-facing-the-problem-with-shadow-stripes-on-model/18065/4 "2020-08-22T10:41:11Z")
same thing, your problem is not shadow
even if I turn off shadows in your renderer, it still see the lines
```
renderer = new THREE.WebGLRenderer({antialias: true});
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.outputEncoding = THREE.sRGBEncoding;
//renderer.shadowMap.enabled = true;
//renderer.shadowMap.type = THREE.PCFSoftShadowMap;
document.body.appendChild(renderer.domElement);
```
---
### Author:  [@harshil\_poly9](https://discourse.threejs.org/u/harshil_poly9)
#### Post date: [August 22, 2020, 11:31am UTC](https://discourse.threejs.org/t/hello-i-am-facing-the-problem-with-shadow-stripes-on-model/18065/5 "2020-08-22T11:31:09Z")
Let me check the other model and give you the exact issue
---
### Author:  [@looeee](https://discourse.threejs.org/u/looeee)
#### Post date: [August 22, 2020, 11:42am UTC](https://discourse.threejs.org/t/hello-i-am-facing-the-problem-with-shadow-stripes-on-model/18065/6 "2020-08-22T11:42:23Z")
Tightening up the shadow frustum and descreasing the bias a bit fixes it:
```javascript
dirLight.shadow.camera.top = 170;
dirLight.shadow.camera.bottom = -70;
dirLight.shadow.camera.left = -150;
dirLight.shadow.camera.right = 150;
dirLight.shadow.camera.near = 25;
dirLight.shadow.camera.far = 250;
dirLight.shadow.bias = -0.005;
```
Updated fiddle: [https://jsfiddle.net/mr1n5scL/](https://jsfiddle.net/mr1n5scL/)
---
### Author:  [@seanwasere](https://discourse.threejs.org/u/seanwasere)
#### Post date: [August 22, 2020, 12:07pm UTC](https://discourse.threejs.org/t/hello-i-am-facing-the-problem-with-shadow-stripes-on-model/18065/7 "2020-08-22T12:07:09Z")
I concede, there is a shadow problem if you look really closely. This is usually solved by tweaking the bias.
Left, shadows enabled in renderer
Right, no shadows enabled in renderer
---
### Author:  [@looeee](https://discourse.threejs.org/u/looeee)
#### Post date: [August 22, 2020, 1:57pm UTC](https://discourse.threejs.org/t/hello-i-am-facing-the-problem-with-shadow-stripes-on-model/18065/8 "2020-08-22T13:57:03Z")
Can you try it with my updated fiddle? I can’t see any artifacts.
---
### Author:  [@seanwasere](https://discourse.threejs.org/u/seanwasere)
#### Post date: [August 22, 2020, 2:10pm UTC](https://discourse.threejs.org/t/hello-i-am-facing-the-problem-with-shadow-stripes-on-model/18065/9 "2020-08-22T14:10:28Z")
Oh no, I just changed the sliders and I broke it. This is a best as I can milk it with those pesky sliders.
---
### Author:  [@didi\_softwares](https://discourse.threejs.org/u/didi_softwares)
#### Post date: [February 6, 2022, 7:17pm UTC](https://discourse.threejs.org/t/hello-i-am-facing-the-problem-with-shadow-stripes-on-model/18065/10 "2022-02-06T19:17:18Z")
> [@looeee](#):
>
> `dirLight.shadow.bias = -0.005;`
its a solution, tanks
---
### Author:  [@aksarov91](https://discourse.threejs.org/u/aksarov91)
#### Post date: [June 7, 2024, 2:37am UTC](https://discourse.threejs.org/t/hello-i-am-facing-the-problem-with-shadow-stripes-on-model/18065/11 "2024-06-07T02:37:05Z")
I have found solution in docs. [three.js docs](https://threejs.org/docs/index.html?q=direc#api/en/lights/shadows/LightShadow.bias)
> Very tiny adjustments here (in the order of `0.0001` ) may help reduce artifacts in shadows