Merge pull request #11454 from NNskelly/patch-2

Update Textures.html

docs/api/constants/Textures.html

@@ -33,9 +33,14 @@
 		[page:Constant CubeReflectionMapping] is the default for a [page:CubeTexture CubeTexture]. <br /><br />
 
 		[page:Constant EquirectangularReflectionMapping] and [page:Constant EquirectangularRefractionMapping]
-		are for use with an equirectangular environment map.<br /><br />
-
-		[page:Constant SphericalReflectionMapping] is for use with a spherical reflection map.<br /><br />
+		are for use with an equirectangular environment map.  Also called a lat-long map, an equirectangular 
+		texture represents a 360-degree view along the horizontal centerline, and a 180-degree view along the 
+		vertical axis, with the top and bottom edges of the image corresponding to the north and south poles 
+		of a mapped sphere.<br /><br />
+
+		[page:Constant SphericalReflectionMapping] is for use with a spherical reflection map such as may be obtained
+		by cropping a photograph of a mirrored ball.  Sphere maps will be rendered "facing" the camera, irrespective
+		of the position of the camera relative to the cubemapped object or surface.<br /><br />
 
 		See the [example:webgl_materials_envmaps materials / envmaps] example.
 		</div>