Matrix4.lookAt(): Added comments.

be57a9cf · Mr.doob · 028a2519 · be57a9cf
隐藏空白更改
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Showing with 4 addition and 0 deletion

src/math/Matrix4.js src/math/Matrix4.js +4 -0

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--- a/src/math/Matrix4.js
+++ b/src/math/Matrix4.js
@@ -326,6 +326,8 @@ Object.assign( Matrix4.prototype, {

 			if ( z.lengthSq() === 0 ) {

+				// eye and target are in the same position
+
 				z.z = 1;

 			}
@@ -335,6 +337,8 @@ Object.assign( Matrix4.prototype, {

 			if ( x.lengthSq() === 0 ) {

+				// eye and target are in the same vertical
+
 				z.z += 0.0001;
 				x.crossVectors( up, z );