Merge pull request #256 from cabanier/aspectratio

Clarify aspectratio

Author: cabanier

webxrlayers-1.bs

@@ -548,7 +548,7 @@ The <dfn attribute for="XRCylinderLayer">radius</dfn> attribute controls the rad
 The <dfn attribute for="XRCylinderLayer">centralAngle</dfn> attribute controls the angle in radians of the visible section of the cylinder.
 It grows symmetrically around the 0 angle.
 
-The <dfn attribute for="XRCylinderLayer">aspectRatio</dfn> attribute controls the ratio of the visible cylinder section.
+The <dfn attribute for="XRCylinderLayer">aspectRatio</dfn> attribute controls the ratio of the visible cylinder section. It is the ratio of the width of the visible section of the cylinder divided by its height. The width is calculated by multiplying the {{XRCylinderLayer/radius}} with the {{XRCylinderLayer/centralAngle}}.
 
 <img alt="description of the parameters of a cylinder layer"src="images/cylinder_layer_params.png" style="width:80%"/>