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Add frame capture to web viewer #1636

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30 changes: 28 additions & 2 deletions javascript/MaterialXView/source/index.js
Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,8 @@ let turntableEnabled = false;
let turntableSteps = 360;
let turntableStep = 0;

let captureRequested = false;

// Get URL options. Fallback to defaults if not specified.
let materialFilename = new URLSearchParams(document.location.search).get("file");
if (!materialFilename) {
Expand All @@ -31,6 +33,18 @@ let viewer = Viewer.create();
init();
viewer.getEditor().updateProperties(0.9);

// Capture the current frame and save an image file.
function captureFrame()
{
let canvas = document.getElementById('webglcanvas');
var url = canvas.toDataURL();
var link = document.createElement('a');
link.setAttribute('href', url);
link.setAttribute('target', '_blank');
link.setAttribute('download', 'screenshot.png');
link.click();
}

function init()
{
let canvas = document.getElementById('webglcanvas');
Expand Down Expand Up @@ -82,9 +96,15 @@ function init()
orbitControls = new OrbitControls(scene.getCamera(), renderer.domElement);
orbitControls.addEventListener('change', () => {
viewer.getScene().setUpdateTransforms();
})
})

// Load model and shaders
// Add hotkey 'f' to capture the current frame and save an image file.
// See check inside the render loop when a capture can be performed.
document.addEventListener('keydown', (event) => {
if (event.key === 'f') {
captureRequested = true;
}
});

// Initialize editor
viewer.getEditor().initialize();
Expand Down Expand Up @@ -160,6 +180,12 @@ function animate()

composer.render();
viewer.getScene().updateTransforms();

if (captureRequested)
{
captureFrame();
captureRequested = false;
}
}

function handleKeyEvents(event)
Expand Down