<div dir="ltr"><div><div><br></div>I believe your fragment shader is not setting the output fragment color at all, which is a minimum requirement for a fragment shader to work.<br><br></div>Christian<br><br></div><div class="gmail_extra"><br><div class="gmail_quote">2015-07-23 23:59 GMT+02:00 Erik Hensens <span dir="ltr"><<a href="mailto:ehensens@hunter.com" target="_blank">ehensens@hunter.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Sorry for the triplicate post, I received an error message on trying to post until I removed the quotes...<br>
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