WebGL Face Mapped Points
Swipe Up or Down Over the Point
This WebGL example draws circular points mapped with a texture. Microsoft browsers haven't implemented point size. Older Android Chrome and Firefox browsers might not run with texture mapped points.
Testing reveals some versions of Internet Explorer for Windows PCs and Windows Phone 8.1 support a maximum point size of one only. In other words each point displays with just one pixel. Very small points render. Apparently WebGL specifications call for one pixel point size as a minimum. Therefore Internet Explorer remains WebGL 1.0 compliant.
However the point examples work fine with iPhone 6 Safari, Android Chrome, as well as Firefox, Chrome, and Microsoft Edge on Windows 10.
One work around, for older browsers, involves preparing circular or square shapes with
vertices or textures. Draw with TRIANGLES
rather than POINTS
.
Call the WebGL method drawElements()
as follows. Number e.nCount
represents the number
of vertices to render and e.nOffset
represents the
location within the Vertex Buffer Object to begin
drawing operations.
gl.drawElements ( gl.TRIANGLES, e.nCount, gl.UNSIGNED_SHORT, e.nOffset );
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