Typically, the shadow appears as shown below:
https://i.sstatic.net/5L9N2.png
However, upon adjusting the parameters of directionalLight.shadow.camera
directionalLight.shadow.camera.left = -50
directionalLight.shadow.camera.right = 50
directionalLight.shadow.camera.top = -50
directionalLight.shadow.camera.bottom = 50
The result now looks like this
https://i.sstatic.net/ewitg.png
What is the solution to this issue?
When creating shadows, a simulated "camera" positioned at the light source is used to determine how accurately the shadow will match your object based on its frustum and resolution. Achieving perfectly detailed shadows over large areas is not possible, so adjusting the shadow camera to focus on the crucial parts of the scene is essential. By expanding the camera's frustum, you increase the covered area but sacrifice precision.
To enhance the outcome, consider these steps:
A. Boost the shadowMap's resolution for better quality shadows, but note that this comes with increased computation time. Opt for values that are powers of 2.
light.shadow.mapSize.width = 1024;
light.shadow.mapSize.height = 1024;
B. Experiment with different shadow types like PCFSoft for improved aesthetics, even though it may impact performance.
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
C. Trim down the dimensions of the shadow camera's frustum to cover only the necessary area. Utilize a CameraHelper to visualize the shadow coverage as demonstrated in this example.
scene.add( new THREE.CameraHelper( light.shadow.camera ) );
Refer to the THREE.LightShadow docs for further guidance.
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