def create_gnomon_camera(self, main_camera):
"""
Creates a camera for observing the gnomon. Borrows some settings from the main camera.
:param main_camera: The main camera that views the instrument components.
:return: The gnomon camera.
"""
aspect = 1
near_plane = 0.1
# Set far plane so that the camera can see the gnomon even when it is turned "behind" it and the cylinders are
# facing away from the camera.
far_plane = 25
gnomon_camera = Qt3DRender.QCamera()
gnomon_camera.setParent(self.gnomon_root_entity)
gnomon_camera.setProjectionType(main_camera.projectionType())
gnomon_camera.lens().setPerspectiveProjection(
main_camera.fieldOfView(), aspect, near_plane, far_plane)
gnomon_camera.setUpVector(main_camera.upVector())
gnomon_camera.setViewCenter(QVector3D(0, 0, 0))
return gnomon_camera
def __init__(self, window):
self.window = window
self.offscreenSurface = QOffscreenSurface()
sformat = QSurfaceFormat.defaultFormat()
sformat.setDepthBufferSize(32)
self.offscreenSurface.setFormat( sformat )
self.offscreenSurface.create()
self.overlayCamera = Qt3DRender.QCamera()
self.overlayCamera.setViewCenter( vec3d() )
self.overlayCamera.setPosition( vec3d( 0, 0, -1 ) )
self.overlayCamera.setUpVector( vec3d( 0, 1, 0 ) )
self.overlayCamera.lens().setOrthographicProjection( -1, 1, -1, 1, -1, 1 )
# Framegraph root #1 -- onscreen rendering
self.surfaceSelector = Qt3DRender.QRenderSurfaceSelector()
self.surfaceSelector.setSurface(window)
self.root = self.surfaceSelector
# Framgraph root #2 -- Used for offscreen renders, not in the graph by default
# During screenshots, offscreenSurfaceSelector becomes the root
# and the branch roots will become a child of renderTargetSelector
self.offscreenSurfaceSelector = Qt3DRender.QRenderSurfaceSelector()
self.offscreenSurfaceSelector.setSurface(self.offscreenSurface)
self.renderTargetSelector = Qt3DRender.QRenderTargetSelector(self.offscreenSurfaceSelector)
self.targetTexture = OffscreenRenderTarget(self.renderTargetSelector)
self.renderTargetSelector.setTarget(self.targetTexture)
self.noDraw2 = Qt3DRender.QNoDraw(self.renderTargetSelector)
# Branch 1: clear buffers
self.clearBuffers = Qt3DRender.QClearBuffers(self.surfaceSelector)
self.clearBuffers.setBuffers(Qt3DRender.QClearBuffers.ColorDepthBuffer)
self.clearBuffers.setClearColor(Qt.white)
self.noDraw = Qt3DRender.QNoDraw(self.clearBuffers)
# Branch 2: main drawing branches using the Athena camera
self.cameraSelector = Qt3DRender.QCameraSelector(self.surfaceSelector)
self.cameraSelector.setCamera(window.camera())
# Branch 2A: solid objects
self.viewport = Qt3DRender.QViewport(self.cameraSelector)
self.viewport.setNormalizedRect(QRectF(0, 0, 1.0, 1.0))
self.qfilt = Qt3DRender.QTechniqueFilter(self.viewport)
self.solidPassFilter = Qt3DRender.QFilterKey(self.qfilt)
self.solidPassFilter.setName('pass')
self.solidPassFilter.setValue('solid')
self.qfilt.addMatch(self.solidPassFilter)
# Branch 2B: transparent objects
self.viewport2 = Qt3DRender.QViewport(self.cameraSelector)
self.viewport2.setNormalizedRect(QRectF(0, 0, 1.0, 1.0))
self.qfilt2 = Qt3DRender.QTechniqueFilter(self.viewport2)
self.transPassFilter = Qt3DRender.QFilterKey(self.qfilt2)
self.transPassFilter.setName('pass')
self.transPassFilter.setValue('transp')
self.qfilt2.addMatch(self.transPassFilter)
# Branch 3: 2D screen overlays
self.cameraSelector2 = Qt3DRender.QCameraSelector(self.surfaceSelector)
self.cameraSelector2.setCamera(self.overlayCamera)
self.viewport3 = Qt3DRender.QViewport(self.cameraSelector2)
self.viewport3.setNormalizedRect(QRectF(0, 0, 1.0, 1.0))
self.qfilt3 = Qt3DRender.QTechniqueFilter(self.viewport3)
self.overlayPassFilter = Qt3DRender.QFilterKey(self.viewport3)
self.overlayPassFilter.setName('pass')
self.overlayPassFilter.setValue('overlay')
self.qfilt3.addMatch(self.overlayPassFilter)
# Branch 4: render capture branch for taking screenshots
self.renderCapture = Qt3DRender.QRenderCapture(self.surfaceSelector)
self.noDraw3 = Qt3DRender.QNoDraw(self.renderCapture)
# Branch roots are the bits that need reparenting when switching between
# offscreen and onscreen rendering
self.branchRoots = [ self.clearBuffers, self.cameraSelector, self.cameraSelector2, self.renderCapture ]