From 0388dfb683fec6c76dc0a418d64bb8653997271e Mon Sep 17 00:00:00 2001
From: Fabien Servant <fabien.servant@technicolor.com>
Date: Wed, 11 Dec 2024 18:22:26 +0100
Subject: [PATCH] Export Mel

---
 meshroom/nodes/aliceVision/ExportMel.py | 173 ++++++++++++++++++++++++
 1 file changed, 173 insertions(+)
 create mode 100644 meshroom/nodes/aliceVision/ExportMel.py

diff --git a/meshroom/nodes/aliceVision/ExportMel.py b/meshroom/nodes/aliceVision/ExportMel.py
new file mode 100644
index 0000000000..10b71f3b6b
--- /dev/null
+++ b/meshroom/nodes/aliceVision/ExportMel.py
@@ -0,0 +1,173 @@
+__version__ = "1.0"
+
+from meshroom.core import desc
+from meshroom.core.utils import VERBOSE_LEVEL
+
+class ExportMel(desc.Node):
+
+    category = 'Export'
+    documentation = '''
+    Export MEL script used to gather objects generated into Maya
+    '''
+
+    inputs = [
+        desc.File(
+            name="input",
+            label="Input SfMData",
+            description="Input SfMData file.",
+            value="",
+        ),
+        desc.File(
+            name="alembic",
+            label="Alembic file",
+            description="Input alembic file.",
+            value="",
+        ),
+        desc.File(
+            name="mesh",
+            label="Input Mesh",
+            description="Input Mesh file.",
+            value="",
+        ),
+        desc.File(
+            name="images",
+            label="Undistorted Images",
+            description="Undistorted images template.",
+            value="",
+        ),
+        desc.ChoiceParam(
+            name="verboseLevel",
+            label="Verbose Level",
+            description="Verbosity level (fatal, error, warning, info, debug, trace).",
+            values=VERBOSE_LEVEL,
+            value="info",
+        ),
+    ]
+
+    outputs = [
+        desc.File(
+            name="output",
+            label="Mel script",
+            description="Generated mel script",
+            value=desc.Node.internalFolder + "import.mel",
+        ),
+    ]
+
+    def processChunk(self, chunk):
+        
+        import pyalicevision
+        import pathlib
+
+        chunk.logManager.start(chunk.node.verboseLevel.value)
+        
+        chunk.logger.info("Open input file")
+        data = pyalicevision.sfmData.SfMData()
+        ret = pyalicevision.sfmDataIO.load(data, chunk.node.input.value, pyalicevision.sfmDataIO.ALL)
+        if not ret:
+            chunk.logger.error("Cannot open input")
+            chunk.logManager.end()
+            raise RuntimeError()
+
+        first = True
+        w = 0
+        h = 0
+        ox = 0
+        oy = 0
+        fx = 0
+        fy = 0
+        
+        intrinsics = data.getIntrinsics()
+        for intrinsicId in intrinsics:
+
+            intrinsic = intrinsics[intrinsicId]
+            if first:
+                w = intrinsic.w()
+                h = intrinsic.h()
+            else:
+                if w != intrinsic.w() or h != intrinsic.h():
+                    chunk.logger.error("Images sizes are non unique")
+                    chunk.logManager.end()
+                    raise RuntimeError()
+
+            cam = pyalicevision.camera.Pinhole.cast(intrinsic)
+            if cam == None:
+                chunk.logger.error("At least one intrinsic is not a required pinhole model")
+                chunk.logManager.end()
+                raise RuntimeError()
+
+            offset = cam.getOffset()
+            pix2inches = cam.sensorWidth() / (25.4 * max(w, h));
+            ox = -pyalicevision.numeric.getX(offset) * pix2inches
+            oy = pyalicevision.numeric.getY(offset) * pix2inches
+
+            scale = cam.getScale()
+            fx = pyalicevision.numeric.getX(scale)
+            fy = pyalicevision.numeric.getY(scale)
+
+
+        minIntrinsicId = 0
+        minFrameId = 0
+        minFrameName = ''
+        first = True
+        views = data.getViews()
+        
+        for viewId in views:
+            
+            view = views[viewId]
+            frameId = view.getFrameId()
+            intrinsicId = view.getIntrinsicId()
+            frameName = pathlib.Path(view.getImageInfo().getImagePath()).stem
+
+            if first or frameId < minFrameId:
+                minFrameId = frameId
+                minIntrinsicId = intrinsicId
+                minFrameName = frameName
+                first = False
+        
+
+        alembic = chunk.node.alembic.value
+        abcString = f'AbcImport -mode open -fitTimeRange "{alembic}";'
+
+        mesh = chunk.node.mesh.value
+        objString = f'file -import -type "OBJ"  -ignoreVersion -ra true -mbl true -mergeNamespacesOnClash false -namespace "mesh" -options "mo=1"  -pr  -importTimeRange "combine" "{mesh}";'
+
+        framePath = chunk.node.images.value.replace('<INTRINSIC_ID>', str(minIntrinsicId)).replace('<FILESTEM>', minFrameName)
+
+        camString = f'''
+        select -r mvgCameras ;
+        string $camName[] = `listRelatives`;
+
+        currentTime {minFrameId};
+
+        imagePlane -c $camName[0] -fileName "{framePath}";
+        
+        setAttr "imagePlaneShape1.useFrameExtension" 1;
+        setAttr "imagePlaneShape1.offsetX" {ox};
+        setAttr "imagePlaneShape1.offsetY" {oy};
+        '''
+
+        ipa = fx / fy
+        advCamString = ''
+
+        if abs(ipa - 1.0)  < 1e-6:
+            advCamString = f'''
+            setAttr "imagePlaneShape1.fit" 1;
+            '''
+        else:
+            advCamString = f'''
+            setAttr "imagePlaneShape1.fit" 4;
+            setAttr "imagePlaneShape1.squeezeCorrection" {ipa};
+            
+            select -r $camName[0];
+            float $vaperture = `getAttr ".verticalFilmAperture"`;
+            float $scaledvaperture = $vaperture * {ipa};
+            setAttr "imagePlaneShape1.sizeY" $scaledvaperture;
+            '''
+
+        with open(chunk.node.output.value, "w") as f:
+            f.write(abcString + '\n')
+            f.write(objString + '\n')
+            f.write(camString + '\n')
+            f.write(advCamString + '\n')
+
+        chunk.logManager.end()