SVG-conversion, possible filedialogs, GPU slicing

Added conversion of Slic3r multi svg-file to photon
Added arguments to show dialogs for selecting input file and output file/directory
Ported hackathon-slicer to python (GPU slicing) which can be used with argument -f False

Author: NardJ

GL_Stl2Slices.py

@@ -0,0 +1,244 @@
+# Port of https:#github.com/Formlabs/hackathon-slicer/blob/master/app/js/slicer.js
+#
+#
+
+# internal
+import struct
+import math
+import time
+import os
+import sys # for stdout
+
+# external
+import cv2
+import numpy
+
+# user
+import GL_Viewport
+import rleEncode
+from PhotonFile import *
+
+
+class GL_Stl2Slices:
+    gui=False
+    viewport = None
+
+    def clearModel(self):
+        self.points = []
+        self.normals = []
+        self.cmin = []
+        self.cmax = []
+
+    def load_binary_stl(self,filename, scale=1):
+        print("Reading binary")
+        # filebytes = os.path.getsize(filename)
+
+        #scale=scale*0.1
+        fp = open(filename, 'rb')
+
+        h = fp.read(80)
+        l = struct.unpack('I', fp.read(4))[0]
+        count = 0
+
+        t0 = time.time()
+
+        self.clearModel()
+        points = []
+        normals = []
+        filepos = 0
+        while True:
+            try:
+                p = fp.read(12)
+                if len(p) == 12:
+                    n = struct.unpack('f', p[0:4])[0], struct.unpack('f', p[4:8])[0], struct.unpack('f', p[8:12])[0]
+
+                p = fp.read(12)
+                if len(p) == 12:
+                    p1 = struct.unpack('f', p[0:4])[0], struct.unpack('f', p[4:8])[0], struct.unpack('f', p[8:12])[0]
+
+                p = fp.read(12)
+                if len(p) == 12:
+                    p2 = struct.unpack('f', p[0:4])[0], struct.unpack('f', p[4:8])[0], struct.unpack('f', p[8:12])[0]
+
+                p = fp.read(12)
+                if len(p) == 12:
+                    p3 = struct.unpack('f', p[0:4])[0], struct.unpack('f', p[4:8])[0], struct.unpack('f', p[8:12])[0]
+
+                if len(p) == 12:
+                    # switch coordinates to OpenGL
+                    a = 0
+                    b = 1
+                    c = 2
+                    n = [n[a], n[b], n[c]]
+                    p1 = [p1[a], p1[b], p1[c]]
+                    p2 = [p2[a], p2[b], p2[c]]
+                    p3 = [p3[a], p3[b], p3[c]]
+
+                    # add points to array
+                    points.append(p1)
+                    points.append(p2)
+                    points.append(p3)
+                    normals.append(n)
+
+                count += 1
+                fp.read(2)
+
+                # Check if we reached end of file
+                if len(p) == 0:
+                    break
+            except EOFError:
+                break
+        fp.close()
+
+        # t1=time.time()
+        # print ("t1-t0",t1-t0)
+
+        # use numpy for easy and fast center and scale model
+        np_points = numpy.array(points)
+        np_normals = numpy.array(normals)
+
+        # scale model, 1mm should be 1/0,047 pixels
+        #scale=scale/0.047
+        np_points = np_points * scale
+
+        # find max and min of x, y and z
+        x = np_points[:, 0]
+        y = np_points[:, 1]
+        z = np_points[:, 2]
+        self.cmin = (x.min(), y.min(), z.min())
+        self.cmax = (x.max(), y.max(), z.max())
+        self.modelheight = self.cmax[2] - self.cmin[2]
+        #print ("min: ",self.cmin)
+        #print ("max: ",self.cmax)
+
+        # Center model and put on base
+        #trans = [0, 0, 0]
+        #trans[0] = -(self.cmax[0] - self.cmin[0]) / 2 - self.cmin[0]
+        #trans[1] = -(self.cmax[2] - self.cmin[2]) / 2 - self.cmin[2]
+        #trans[2] = -self.cmin[1]
+
+        # We want the model centered in 2560x1440
+        # 2560x1440 pixels equals 120x67
+        #trans[0] = trans[0] +1440 / 2
+        #trans[2] = trans[2] +2560 / 2
+
+        # Center numpy array of points which is returned for fast OGL model loading
+        #np_points = np_points + trans
+
+        # Find bounding box again
+        x = np_points[:, 0]
+        y = np_points[:, 1]
+        z = np_points[:, 2]
+        self.cmin = (x.min(), y.min(), z.min())
+        self.cmax = (x.max(), y.max(), z.max())
+
+        # align coordinates on grid
+        # this will reduce number of points and speed up loading
+        # with benchy grid-screenres/1:  total time 28 sec, nr points remain 63k , but large artifacts
+        # with benchy grid-screenres/50: total time 39 sec, nr points remain 112k, no artifacts
+        # w/o benchy :                   total time 40 sec, nr points remain 113k, no artifacts
+        #screenres = 0.047
+        #grid = screenres / 50  # we do not want artifacts but reduce rounding errors in the file to cause misconnected triangles
+        #np_points = grid * (np_points // grid)
+
+
+        # return points and normal for OGLEngine to display
+        return np_points, np_normals
+
+    def __init__(self, stlfilename, scale=1,
+                 outputpath=None,       # should end with '/'
+                 layerheight=0.05,
+                 photonfilename=None,   # keep outputpath=None if output to photonfilename
+                 normalexposure=8.0,
+                 bottomexposure=90,
+                 bottomlayers=8,
+                 offtime=6.5,
+                 ):
+        self.viewport = GL_Viewport.Viewport()
+
+        # Get path of script/exe for local resources like iconpath and newfile.photon
+        if getattr(sys, 'frozen', False):# frozen
+            self.installpath = os.path.dirname(sys.executable)
+        else: # unfrozen
+            self.installpath = os.path.dirname(os.path.realpath(__file__))
+
+        # Measure how long it takes
+        t1 = time.time()
+
+        # Setup output path
+        if outputpath==None and photonfilename==None:return
+
+        #create path if not exists
+        if not outputpath==None:
+            if not os.path.exists(outputpath):
+                os.makedirs(outputpath)
+
+        # if we output to PhotonFile we need a place to store RunLengthEncoded images
+        if not photonfilename==None:
+            rlestack=[]
+
+        # Load 3d Model in memory
+        points, normals = self.load_binary_stl(stlfilename, scale=scale)
+
+        # Check if inside build area
+        size=(self.cmax[0]-self.cmin[0],self.cmax[1]-self.cmin[1],self.cmax[2]-self.cmin[2])
+        if size[0]>65 or size[1]>115:
+           sizestr="("+str(int(size[0]))+"x"+str(int(size[2]))+")"
+           areastr="(65x115)"
+           errmsg="Model is too big "+sizestr+" for build area "+areastr+". Maybe try another orientation, use the scale argument (-s or --scale) or cut up the model."
+           if not self.gui: 
+              print (errmsg)
+           else:
+              sys.tracebacklimit = None
+              raise Exception(errmsg)
+              sys.tracebacklimit = 0
+           sys.exit() # quit() does not work if we make this an exe with cx_Freeze
+    
+
+        # Load mesh
+        #print ("loading mesh")
+        self.viewport.loadMesh(points,normals,self.cmin,self.cmax);
+        #self.viewport.display() # this will loop until window is closed
+        self.viewport.draw()
+        
+        microns = layerheight*1000 #document.getElementById("height").value;
+        bounds = self.viewport.getBounds()
+        #print ((bounds['zmax']-bounds['zmin']) , self.viewport.printer.getGLscale())
+        #quit()
+        zrange_mm=(bounds['zmax']-bounds['zmin']) / self.viewport.printer.getGLscale()
+        count=math.ceil(zrange_mm * 1000 / microns);        
+        #print ("b",bounds)
+        #print ("z",zrange_mm)
+        #print ("m",microns)
+        #print ("c",count)
+ 
+        if not photonfilename==None:
+            rlestack=[]
+
+        for i in range(0,count):
+            data = self.viewport.getSliceAt(i / count)
+            img=data.reshape(2560,1440,4)
+            imgarr8=img[:,:,1]
+            if photonfilename==None:            
+	            Sstr = "%04d" % i
+	            filename = outputpath+Sstr + ".png"            
+	            print (i,"/",count,filename)
+	            cv2.imwrite(filename, imgarr8)  
+            else:
+                img1D=imgarr8.flatten(0)
+                rlestack.append(rleEncode.encodedBitmap_Bytes_numpy1DBlock(img1D))
+
+
+        if not photonfilename==None:
+            tempfilename=os.path.join(self.installpath,"newfile.photon")
+            photonfile=PhotonFile(tempfilename)
+            photonfile.readFile()
+            photonfile.Header["Layer height (mm)"]= PhotonFile.float_to_bytes(layerheight)
+            photonfile.Header["Exp. time (s)"]    = PhotonFile.float_to_bytes(normalexposure)
+            photonfile.Header["Exp. bottom (s)"]  = PhotonFile.float_to_bytes(bottomexposure)
+            photonfile.Header["# Bottom Layers"]  = PhotonFile.int_to_bytes(bottomlayers)
+            photonfile.Header["Off time (s)"]     = PhotonFile.float_to_bytes(offtime)
+            photonfile.replaceBitmaps(rlestack)
+            photonfile.writeFile(photonfilename)
+
+        print("Elapsed: ", "%.2f" % (time.time() - t1), "secs")