The shadow effect in three.js differs from that in Unity 3D

When I import a 3D model in .fbx format to my scene using three.js, I noticed that the shadow effect is not as sharp as when using Unity. The shadows appear too blurry.

Is there a way to adjust the shadowMap setting in three.js to match the shadow quality in Unity?

Below is the code snippet I currently have:

light = scene.getObjectByName("DirectionalLight");
light.castShadow = true;
light.shadowMap.type = THREE.PCFSoftShadowMap;
light.shadow.mapSize.width = 1024;
light.shadow.mapSize.height = 1024;

Any advice on how to achieve similar shadow quality would be greatly appreciated! Thank you!

javascriptunity-game-enginemodelthree.js3d

Answer №1

Your issues with artifacts stem from the lack of shadow map precision. One way to address this is by disabling PCF, which can be done by setting 

light.shadowMap.type = THREE.BasicShadowMap
(this should also eliminate blurriness). While reducing PCF kernel size can help reduce blurriness, it appears that there are no options for fine-tuning this in three.js.

You may see a slight improvement by increasing the shadow map resolution to 2048, but it may not be sufficient for a large scene.

Unity utilizes cascaded shadow maps while three.js relies on a single shadow map for the entire scene, leading to a significant difference in quality. Check out Unity's cascaded shadow maps documentation and Unity's recommendations for directional light shadows. For more information on improving shadow depth maps, refer to these MSDN docs.

If your scene is static, consider implementing lightmaps as they can enhance performance as well as the overall visual quality.

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