Well someone obviously doesn't like the question but I am sure others have had the problem so here is how I solved it.
I created a web page that rendered the image using jsc3d
<html>
<header>
<link rel="stylesheet" href="/web_inc/all.css">
<script type="text/JavaScript" src="/web_inc/jquery-1.11.3.min.js"></script>
<script type="text/javascript" src="/web_inc/jquery.form.min.js"></script>
<link rel="stylesheet" href="/web_inc/bootstrap.min.css">
<link rel="stylesheet" href="/web_inc/bootstrap-theme.min.css">
<script type="text/javascript" src="/web_inc/bootstrap.min.js"></script>
<script type="text/javascript" src="/web_inc/jsc3d.js"></script>
<script type="text/javascript" src="/web_inc/jsc3d.console.js"></script>
<script type="text/javascript" src="/web_inc/jsc3d.webgl.js"></script>
<script type="text/javascript" src="/web_inc/jsc3d.touch.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var canvas = document.getElementById('cv');
canvas.width=1200;
canvas.height=900;
var viewer = new JSC3D.Viewer(canvas);
viewer.setParameter('SceneUrl', '/model/1.stl');
viewer.setParameter('InitRotationX', 0);
viewer.setParameter('InitRotationY', 30);
viewer.setParameter('InitRotationZ', 0);
viewer.setParameter('ModelColor', '#57524C');
viewer.setParameter('BackgroundColor1', '#FFFFFF');
viewer.setParameter('BackgroundColor2', '#999999');
viewer.setParameter('RenderMode', 'flat');
viewer.setParameter('MipMapping', 'on');
viewer.setParameter('Renderer', 'webgl');
viewer.setParameter('Definition', 'high');
viewer.init();
viewer.update();
});
function savePreview() {
var canvas = document.getElementById("cv");
$("#imageData").val(canvas.toDataURL("image/png"));
$("#uploadForm").ajaxSubmit({url: '/ajax_update_sim.php', type: 'post'});
}
</script>
</header>
<body>
<canvas id="cv" class="viewerCanvas"></canvas>
<form action="/ajax_upload_sim.php" method="post" enctype="multipart/form-data" id="uploadForm">
<input type="hidden" name="id" value="1">
<input type="hidden" name="data" id="imageData">
</form>
<input type="button" class="button" value="Save Preview" onclick="savePreview();"/>
</body>
</html>
I then created a php file to save the results
$src="img/1.png"
file_put_contents($src, base64_decode(explode(",", $_REQUEST['data'])[1]));
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