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import bpy |
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import math |
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# ========================= |
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# USER SETTINGS |
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# ========================= |
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OBJ_PATH = "/absolute/path/to/toolpath.obj" |
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NOZZLE_DIAMETER_MM = 0.4 |
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MM_TO_M = 0.001 |
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FPS = 30 |
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DURATION_SECONDS = 8 |
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FRAMES = FPS * DURATION_SECONDS |
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OUTPUT_PATH = "//print_simulation.webm" |
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# ========================= |
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# CLEAN SCENE |
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# ========================= |
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bpy.ops.object.select_all(action='SELECT') |
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bpy.ops.object.delete() |
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scene = bpy.context.scene |
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scene.unit_settings.system = 'METRIC' |
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scene.unit_settings.scale_length = 1.0 |
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# ========================= |
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# IMPORT OBJ |
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# ========================= |
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bpy.ops.import_scene.obj(filepath=OBJ_PATH) |
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imported = bpy.context.selected_objects |
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for obj in imported: |
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obj.scale = (MM_TO_M, MM_TO_M, MM_TO_M) |
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bpy.ops.object.transform_apply(scale=True) |
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# ========================= |
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# CONVERT TO CURVES |
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# ========================= |
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for obj in imported: |
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bpy.context.view_layer.objects.active = obj |
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bpy.ops.object.convert(target='CURVE') |
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# ========================= |
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# NOZZLE PROFILE |
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# ========================= |
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bpy.ops.curve.primitive_bezier_circle_add( |
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radius=(NOZZLE_DIAMETER_MM * MM_TO_M) / 2 |
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) |
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nozzle = bpy.context.active_object |
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nozzle.name = "NozzleProfile" |
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# ========================= |
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# BEVEL CURVES → FILAMENT |
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# ========================= |
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for obj in bpy.context.scene.objects: |
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if obj.type == 'CURVE' and obj != nozzle: |
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obj.data.bevel_mode = 'OBJECT' |
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obj.data.bevel_object = nozzle |
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obj.data.fill_mode = 'FULL' |
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# ========================= |
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# CONVERT TO SINGLE MESH |
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# ========================= |
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filament_objs = [o for o in bpy.context.scene.objects if o.type == 'CURVE' and o != nozzle] |
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for obj in filament_objs: |
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bpy.context.view_layer.objects.active = obj |
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bpy.ops.object.convert(target='MESH') |
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bpy.ops.object.select_all(action='DESELECT') |
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for obj in bpy.context.scene.objects: |
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if obj.type == 'MESH': |
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obj.select_set(True) |
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bpy.context.view_layer.objects.active = bpy.context.selected_objects[0] |
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bpy.ops.object.join() |
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print_obj = bpy.context.active_object |
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print_obj.name = "Print" |
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# ========================= |
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# FILAMENT MATERIAL |
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# ========================= |
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mat = bpy.data.materials.new("Filament") |
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mat.use_nodes = True |
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bsdf = mat.node_tree.nodes["Principled BSDF"] |
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bsdf.inputs["Base Color"].default_value = (0.9, 0.3, 0.1, 1) |
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bsdf.inputs["Roughness"].default_value = 0.55 |
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bsdf.inputs["Specular"].default_value = 0.3 |
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print_obj.data.materials.append(mat) |
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# ========================= |
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# CREATE CUTTER (NEGATIVE PRISM) |
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# ========================= |
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bpy.ops.mesh.primitive_cube_add(size=1) |
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cutter = bpy.context.active_object |
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cutter.name = "Cutter" |
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# Fit cutter to print bounds |
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bbox = [print_obj.matrix_world @ v.co for v in print_obj.data.vertices] |
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xs = [v.x for v in bbox] |
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ys = [v.y for v in bbox] |
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zs = [v.z for v in bbox] |
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cutter.scale.x = (max(xs) - min(xs)) * 0.6 |
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cutter.scale.y = (max(ys) - min(ys)) * 0.6 |
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cutter.scale.z = (max(zs) - min(zs)) * 0.6 |
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min_z = min(zs) - cutter.scale.z |
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max_z = max(zs) + 0.001 |
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cutter.location = (0, 0, min_z) |
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# ========================= |
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# BOOLEAN MODIFIER |
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# ========================= |
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mod = print_obj.modifiers.new(name="Reveal", type='BOOLEAN') |
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mod.operation = 'DIFFERENCE' |
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mod.object = cutter |
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mod.solver = 'FAST' |
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# ========================= |
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# ANIMATE CUTTER (LINEAR!) |
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# ========================= |
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scene.frame_start = 1 |
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scene.frame_end = FRAMES |
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cutter.location.z = min_z |
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cutter.keyframe_insert("location", frame=1) |
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cutter.location.z = max_z |
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cutter.keyframe_insert("location", frame=FRAMES) |
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action = cutter.animation_data.action |
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for fcurve in action.fcurves: |
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for kp in fcurve.keyframe_points: |
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kp.interpolation = 'LINEAR' |
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# ========================= |
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# CAMERA |
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# ========================= |
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bpy.ops.object.camera_add(location=(0.4, -0.4, 0.35)) |
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cam = bpy.context.active_object |
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cam.rotation_euler = (1.1, 0, 0.8) |
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cam.data.lens = 50 |
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scene.camera = cam |
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# ========================= |
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# LIGHTING |
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# ========================= |
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bpy.ops.object.light_add(type='AREA', location=(0.3, -0.3, 0.4)) |
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key = bpy.context.active_object |
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key.data.energy = 1200 |
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key.data.size = 0.25 |
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bpy.ops.object.light_add(type='AREA', location=(-0.3, -0.2, 0.3)) |
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fill = bpy.context.active_object |
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fill.data.energy = 500 |
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fill.data.size = 0.35 |
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fill.data.use_shadow = False |
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bpy.ops.object.light_add(type='AREA', location=(0.0, 0.4, 0.35)) |
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rim = bpy.context.active_object |
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rim.data.energy = 800 |
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rim.data.size = 0.15 |
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# ========================= |
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# BACKGROUND |
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# ========================= |
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world = scene.world |
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world.use_nodes = True |
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bg = world.node_tree.nodes["Background"] |
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bg.inputs[0].default_value = (0.15, 0.15, 0.15, 1) |
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bg.inputs[1].default_value = 1.0 |
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# ========================= |
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# RENDER SETTINGS (WEBM) |
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# ========================= |
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scene.render.engine = 'BLENDER_EEVEE' |
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scene.render.fps = FPS |
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scene.render.use_motion_blur = False |
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scene.render.image_settings.file_format = 'FFMPEG' |
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scene.render.ffmpeg.format = 'WEBM' |
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scene.render.ffmpeg.codec = 'VP9' |
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scene.render.ffmpeg.constant_rate_factor = 'MEDIUM' |
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scene.render.filepath = OUTPUT_PATH |
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# ========================= |
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# RENDER |
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# ========================= |
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bpy.ops.render.render(animation=True) |
