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Author: dudecon

Blender Laser NC Export.blend

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+import bpy
+from bpy import context as C
+from pathlib import Path
+from math import sqrt
+
+
+JOGSPD = 1200
+LSRSPD = 700
+LSRPOW = 255
+
+VERBOSE = False
+
+ob = C.active_object
+obname = ob.name
+bpy.ops.object.duplicate()
+bpy.ops.object.convert()
+dta = C.active_object.data
+bpy.ops.object.delete()
+C.view_layer.objects.active = ob
+ob.select_set(True)
+
+savefile = f'//{obname}_bl.nc'
+
+# store the edges as vert index pair tuples
+edges = [(e.vertices[0], e.vertices[1]) for e in dta.edges]
+# store the vertices as x,y tuples
+verts = [(v.co[0], v.co[1]) for v in dta.vertices]
+
+# build an array for finding any "corner" verticies.
+# These are verticies which have anything other than 2 edges connected to them.
+
+vertedgecounts = {}
+def vertfound(i, d):
+    if i in d: d[i] += 1
+    else: d[i] = 1
+vertconnections = {}
+def vertedge(i, c, d):
+    if i in d: d[i].append(c)
+    else: d[i] = [c]
+for e in edges:
+    for id in (0,1): vertfound(e[id], vertedgecounts)
+    for id in (0,1):
+        connec = e[abs(id-1)]
+        vertedge(e[id], connec, vertconnections)
+
+cornerverts = set()
+for vt in vertedgecounts:
+    ct = vertedgecounts[vt]
+    if ct != 2: cornerverts.add(vt)
+
+# build segments
+segments = []
+for corner in cornerverts:
+    edgecounts = vertedgecounts[corner]
+    while (corner in vertconnections) and (len(vertconnections[corner]) > 0):
+        newsegment = [corner]
+        thisvert = corner
+        while True:
+            nextvert = vertconnections[thisvert].pop()
+            if len(vertconnections[thisvert]) == 0:
+                del(vertconnections[thisvert])
+            vertconnections[nextvert].remove(thisvert)
+            newsegment.append(nextvert)
+            thisvert = nextvert
+            if thisvert in cornerverts:
+                if len(vertconnections[thisvert]) == 0:
+                    del(vertconnections[thisvert])
+                break
+            if len(vertconnections[thisvert]) == 0:
+                print("corner counting went wrong")
+                raise
+        segments.append(newsegment)
+
+if VERBOSE: print(obname)
+#print(edges)
+if VERBOSE: print(len(edges))
+#print(verts)
+if VERBOSE: print(len(verts))
+#print(cornerverts)
+#print(vertconnections)
+#print(segments)
+
+loops = []
+# all of the verts should have exactly 2 connections now
+while len(vertconnections):
+    loopvert, connections = vertconnections.popitem()
+    vertconnections[loopvert] = connections
+    newloop = [loopvert]
+    thisvert = loopvert
+    while True:
+#        print(thisvert)
+        nextvert = vertconnections[thisvert].pop()
+        del(vertconnections[thisvert])
+        if nextvert == loopvert:
+            break
+        vertconnections[nextvert].remove(thisvert)
+        newloop.append(nextvert)
+        thisvert = nextvert
+    loops.append(newloop)
+
+#print(vertconnections)
+#print(loops)
+
+# generate the point search list
+pointstosearch = []
+def grabpointdata(pid, group = 0):
+    pointdata = {}
+    pointdata['P'] = pid
+    coords = verts[pid]
+    pointdata['X'] = coords[0]
+    pointdata['Y'] = coords[1]
+    if group: pointdata['G'] = group
+    return pointdata
+for seg in segments:
+    for i in (0,-1): pointstosearch.append(grabpointdata(seg[i], seg))
+for loop in loops:
+    for i in range(len(loop)//2): pointstosearch.append(grabpointdata(loop[i*2], loop))
+
+# Generate the header, and initialize the machine
+OutString = "(Gcode generated by Tryop Blender Exporter)\n"
+# G20 is inches, G21 is mm
+OutString += "G21\n"
+# G90 is absolute, G91 is incremental
+OutString += "G90\n"
+# M05 is spindle off
+# M03 is spindle on, s is the spindle speed (or laser power in this case), from 0 to 255
+OutString += "M03 S0\n"
+# G00 is rapid move
+OutString += f"G00 X0 Y0 F{JOGSPD}\n"
+
+def dist(p1,p2):
+    return sqrt((p1["X"]-p2["X"])**2 + (p1["Y"]-p2["Y"])**2)
+
+X = 0.
+Y = 0.
+curpos = {}
+curpos['X'] = X
+curpos['Y'] = Y
+
+def close(p1): return dist(p1, curpos)
+
+while len(pointstosearch):
+    pointstosearch.sort(key=close)
+    # if VERBOSE: print(pointstosearch)
+    curpos = pointstosearch[0]
+    pidx = curpos['P']
+    grp = curpos['G']
+    to_remove = []
+    for pnt in pointstosearch:
+        if pnt['G'] == grp: to_remove.append(pnt)
+    for pnt in to_remove:
+        pointstosearch.remove(pnt)
+    # re-order the group
+    if grp in loops:
+        grpidx = grp.index(pidx)
+        grp = grp[grpidx:] + grp[:grpidx]
+        grp.append(grp[0])
+    else:
+        if grp[-1] == pidx:
+            grp.reverse()
+    if VERBOSE: print(grp)
+    X = curpos['X']
+    Y = curpos['Y']
+    # for each segment or loop, jog to the start, turn on the laser, complete the path, and turn off again.
+    OutString += f"G00 X{X:.2f} Y{Y:.2f} F{JOGSPD}\n"
+    # M03 is spindle on, s is the spindle speed (or laser power in this case), from 0 to 255
+    OutString += f"M03 S{LSRPOW}\n"
+    for curidx in grp[1:]:
+        curpos = grabpointdata(curidx)
+        X = curpos['X']
+        Y = curpos['Y']
+        # G01 is linear motion
+        OutString += f"G01 X{X:.2f} Y{Y:.2f} F{LSRSPD}\n"
+    # when done, turn the laser back off
+    OutString += "M03 S0\n"
+
+# when all the engraving is done, turn the laser off and jog back to the origin
+OutString += "M05\n"
+OutString += f"G00 X0 Y0 F{JOGSPD}\n"
+
+
+fp = Path(bpy.path.abspath(savefile))
+try:
+    f = open(fp, 'w')
+    f.write(OutString)
+    f.close()
+    if VERBOSE: print('File Saved')
+except:
+    if VERBOSE: print('exception found while saving file')