Prevent infinite loop in Mesh.raycast(). (#22068)

src/objects/Mesh.js

@@ -170,7 +170,7 @@ class Mesh extends Object3D {
 						const groupMaterial = material[ group.materialIndex ];
 
 						const start = Math.max( group.start, drawRange.start );
-						const end = Math.min( ( group.start + group.count ), ( drawRange.start + drawRange.count ) );
+						const end = Math.min( index.count, Math.min( ( group.start + group.count ), ( drawRange.start + drawRange.count ) ) );
 
 						for ( let j = start, jl = end; j < jl; j += 3 ) {
 
@@ -228,7 +228,7 @@ class Mesh extends Object3D {
 						const groupMaterial = material[ group.materialIndex ];
 
 						const start = Math.max( group.start, drawRange.start );
-						const end = Math.min( ( group.start + group.count ), ( drawRange.start + drawRange.count ) );
+						const end = Math.min( position.count, Math.min( ( group.start + group.count ), ( drawRange.start + drawRange.count ) ) );
 
 						for ( let j = start, jl = end; j < jl; j += 3 ) {