Add SiEPIC EBeam PDK and fix chip base placement

README.md

@@ -28,6 +28,7 @@ BlenderGDS enables semiconductor layout visualization by importing GDSII files i
 * IHP Open PDK (SG13G2 & CMOS5L)
 * SkyWater SKY130 PDK
 * GlobalFoundries GF180MCU PDK
+* SiEPIC EBeam PDK (silicon photonics)
 
 ## Installation
 

import_gdsii/__init__.py

@@ -51,14 +51,19 @@
         'config_path': 'configs/gf180mcu.yaml',
         'color_path': 'configs/colors/gf180mcu/'
     },
+    'SIEPIC_EBEAM': {
+        'name': 'SiEPIC EBeam PDK',
+        'config_path': 'configs/siepic.yaml',
+        'color_path': 'configs/colors/siepic/'
+    },
 }
 
 
 # ============================================================================
 # SCENE SETUP FUNCTIONS
 # ============================================================================
 
-def setup_chip_scene(chip_x, chip_y, collection=None):
+def setup_chip_scene(x_min, y_min, x_max, y_max, collection=None):
     """Initialize scene with camera, light, and chip base"""
     # Determine which collection to use
     target_collection = collection if collection is not None else bpy.context.collection
@@ -126,8 +131,8 @@ def setup_chip_scene(chip_x, chip_y, collection=None):
     target_collection.objects.link(cam)
     bpy.context.scene.camera = cam
 
-    # Position camera above the chip
-    cam.location = (chip_x / 2, chip_y / 2, 200)
+    # Position camera above the chip center
+    cam.location = ((x_min + x_max) / 2, (y_min + y_max) / 2, 200)
     cam.rotation_euler = (0, 0, 0)
 
     # --------------------------
@@ -137,11 +142,11 @@ def setup_chip_scene(chip_x, chip_y, collection=None):
     chip_base = bpy.data.objects.new("ChipBase", mesh)
     target_collection.objects.link(chip_base)
 
-    # Define vertices for a plane of correct size
-    verts = [(0, 0, -1),
-             (0, chip_y, -1),
-             (chip_x, chip_y, -1),
-             (chip_x, 0, -1)]
+    # Define vertices for a plane spanning the actual chip bbox
+    verts = [(x_min, y_min, -1),
+             (x_min, y_max, -1),
+             (x_max, y_max, -1),
+             (x_max, y_min, -1)]
     faces = [(0, 1, 2, 3)]
     mesh.from_pydata(verts, [], faces)
     mesh.update()
@@ -337,6 +342,7 @@ class GDSIIPreImportDialog(bpy.types.Operator):
             ('IHP_SG13CMOS5L', "IHP Open PDK SG13CMOS5L", "IHP SG13CMOS5L 130nm CMOS5L process"),
             ('SKY130', "SkyWater SKY130 PDK", "SkyWater SKY130 130nm process"),
             ('GF180MCU', "GlobalFoundries GF180MCU PDK", "GlobalFoundries GF180MCU 180nm process"),
+            ('SIEPIC_EBEAM', "SiEPIC EBeam PDK", "SiEPIC EBeam silicon photonics PDK (220 nm SOI)"),
         ],
         default='IHP_SG13G2',
     )
@@ -607,19 +613,16 @@ def import_gdsii(self, context, filepath):
                     self.crop_y + self.crop_height
                 )
                 crop_offset = (self.crop_x, self.crop_y)
-                chip_width = self.crop_width
-                chip_height = self.crop_height
+                # Cropped polygons are shifted so the lower-left sits at the origin.
+                bbox_min = (0.0, 0.0)
+                bbox_max = (self.crop_width, self.crop_height)
                 print(f"Cropping to region: X={self.crop_x}, Y={self.crop_y}, W={self.crop_width}, H={self.crop_height}")
             else:
                 # Determine chip dimensions for scene setup
                 lib = gdstk.read_gds(filepath, unit=self.unit_scale)
                 bboxes = [c.bounding_box() for c in lib.top_level() if c.bounding_box() is not None]
-                xmin = min(b[0][0] for b in bboxes)
-                ymin = min(b[0][1] for b in bboxes)
-                xmax = max(b[1][0] for b in bboxes)
-                ymax = max(b[1][1] for b in bboxes)
-                chip_width = xmax - xmin
-                chip_height = ymax - ymin
+                bbox_min = (min(b[0][0] for b in bboxes), min(b[0][1] for b in bboxes))
+                bbox_max = (max(b[1][0] for b in bboxes), max(b[1][1] for b in bboxes))
 
             # Create collection for imported layers
             collection = None
@@ -633,7 +636,7 @@ def import_gdsii(self, context, filepath):
 
             # Setup scene if requested
             if self.setup_scene:
-                setup_chip_scene(chip_width, chip_height, collection)
+                setup_chip_scene(bbox_min[0], bbox_min[1], bbox_max[0], bbox_max[1], collection)
 
             addon_dir = Path(__file__).parent
             if use_custom:

import_gdsii/configs/colors/siepic/fancy.yaml

@@ -0,0 +1,80 @@
+# SPDX-FileCopyrightText: 2026 Tom <tom@flexcompute.com>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+name: Fancy
+description: Fancy color scheme - vivid flat aesthetic
+layers:
+  # Silicon — pink/magenta (matches SiEPIC KLayout default)
+  Si:
+    color: [1.00, 0.50, 0.66, 1.0]
+    metallic: 0.0
+    roughness: 1.0
+  SiRib90:
+    color: [0.50, 0.66, 1.00, 1.0]
+    metallic: 0.0
+    roughness: 1.0
+  SiLitho193:
+    color: [0.80, 0.50, 0.66, 1.0]
+    metallic: 0.0
+    roughness: 1.0
+
+  # SiN — light blue
+  SiN:
+    color: [0.65, 0.81, 0.89, 0.95]
+    metallic: 0.0
+    roughness: 1.0
+
+  # Doping — vivid violet / blue
+  SiNdope:
+    color: [0.44, 0.00, 1.00, 0.95]
+    metallic: 0.0
+    roughness: 1.0
+  SiNppdope:
+    color: [0.10, 0.20, 1.00, 0.95]
+    metallic: 0.0
+    roughness: 1.0
+
+  # Oxide open — orange
+  OxideOpen:
+    color: [1.00, 0.68, 0.00, 0.6]
+    metallic: 0.0
+    roughness: 1.0
+
+  # M1 heater — gold/yellow
+  M1Heater:
+    color: [0.92, 0.78, 0.20, 1.0]
+    metallic: 0.0
+    roughness: 1.0
+
+  # VC — deep purple
+  VC:
+    color: [0.23, 0.01, 0.50, 1.0]
+    metallic: 0.0
+    roughness: 1.0
+
+  # M2 — vivid blue
+  M2Router:
+    color: [0.20, 0.44, 0.92, 1.0]
+    metallic: 0.0
+    roughness: 1.0
+
+  # Metal opening — black
+  MOpen:
+    color: [0.00, 0.00, 0.00, 1.0]
+    metallic: 0.0
+    roughness: 1.0
+
+  # Etches — silvery / pale green
+  DeepTrench:
+    color: [0.75, 0.75, 0.75, 1.0]
+    metallic: 0.0
+    roughness: 1.0
+  IsolationTrench:
+    color: [0.75, 0.75, 0.75, 1.0]
+    metallic: 0.0
+    roughness: 1.0
+  ShelfEtch:
+    color: [0.75, 0.88, 0.75, 1.0]
+    metallic: 0.0
+    roughness: 1.0

import_gdsii/configs/colors/siepic/marketing-gold.yaml

@@ -0,0 +1,75 @@
+# SPDX-FileCopyrightText: 2026 Tom <tom@flexcompute.com>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+name: Marketing (Gold)
+description: Marketing color scheme with gold
+layers:
+  # Silicon — vibrant violet-grey
+  Si:
+    color: [0.50, 0.40, 0.65, 1.0]
+    metallic: 0.6
+    roughness: 0.35
+  SiRib90:
+    color: [0.40, 0.50, 0.70, 1.0]
+    metallic: 0.6
+    roughness: 0.35
+  SiLitho193:
+    color: [0.62, 0.40, 0.62, 1.0]
+    metallic: 0.6
+    roughness: 0.35
+
+  # SiN — clean teal
+  SiN:
+    color: [0.55, 0.78, 0.78, 0.85]
+    roughness: 0.3
+
+  # Doping — rich pink/violet
+  SiNdope:
+    color: [0.65, 0.30, 0.55, 0.95]
+    metallic: 0.5
+    roughness: 0.4
+  SiNppdope:
+    color: [0.40, 0.20, 0.65, 0.95]
+    metallic: 0.5
+    roughness: 0.4
+
+  # Oxide opening — warm gold tint
+  OxideOpen:
+    color: [0.98, 0.78, 0.30, 0.5]
+    metallic: 0.4
+    roughness: 0.3
+
+  # Heater — gold accent
+  M1Heater:
+    color: [0.92, 0.72, 0.22, 1.0]
+    metallic: 0.8
+    roughness: 0.3
+
+  # VC — gold via
+  VC:
+    color: [0.86, 0.62, 0.20, 1.0]
+    metallic: 0.8
+    roughness: 0.3
+
+  # M2 routing — luxurious gold
+  M2Router:
+    color: [0.98, 0.82, 0.32, 1.0]
+    metallic: 0.85
+    roughness: 0.25
+
+  # Passivation opening — deep contrast
+  MOpen:
+    color: [0.06, 0.06, 0.08, 0.9]
+    roughness: 0.55
+
+  # Etches — cool dark contrast
+  DeepTrench:
+    color: [0.04, 0.04, 0.06, 0.95]
+    roughness: 0.7
+  IsolationTrench:
+    color: [0.10, 0.10, 0.12, 0.9]
+    roughness: 0.6
+  ShelfEtch:
+    color: [0.30, 0.28, 0.26, 0.8]
+    roughness: 0.5

import_gdsii/configs/colors/siepic/marketing.yaml

@@ -0,0 +1,74 @@
+# SPDX-FileCopyrightText: 2026 Tom <tom@flexcompute.com>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+name: Marketing
+description: Marketing color scheme
+layers:
+  # Silicon device layer (enhanced purple-grey)
+  Si:
+    color: [0.48, 0.42, 0.55, 1.0]
+    metallic: 0.6
+    roughness: 0.35
+  SiRib90:
+    color: [0.42, 0.46, 0.55, 1.0]
+    metallic: 0.6
+    roughness: 0.35
+  SiLitho193:
+    color: [0.55, 0.42, 0.55, 1.0]
+    metallic: 0.6
+    roughness: 0.35
+
+  # SiN — soft blue tint
+  SiN:
+    color: [0.60, 0.72, 0.78, 0.85]
+    roughness: 0.3
+
+  # Doping — subtle pink/violet
+  SiNdope:
+    color: [0.55, 0.40, 0.55, 0.95]
+    metallic: 0.5
+    roughness: 0.45
+  SiNppdope:
+    color: [0.40, 0.40, 0.70, 0.95]
+    metallic: 0.5
+    roughness: 0.45
+
+  # Oxide opening — warm translucent
+  OxideOpen:
+    color: [0.95, 0.78, 0.55, 0.4]
+    roughness: 0.25
+
+  # Heater — warm metal
+  M1Heater:
+    color: [0.78, 0.66, 0.40, 1.0]
+    metallic: 0.7
+    roughness: 0.4
+
+  # VC — dark contrast tungsten
+  VC:
+    color: [0.38, 0.40, 0.43, 1.0]
+    metallic: 0.8
+    roughness: 0.35
+
+  # M2 routing — bright clean aluminum
+  M2Router:
+    color: [0.78, 0.80, 0.84, 1.0]
+    metallic: 0.8
+    roughness: 0.25
+
+  # Passivation opening
+  MOpen:
+    color: [0.08, 0.08, 0.10, 0.9]
+    roughness: 0.55
+
+  # Etches — cool darker tones
+  DeepTrench:
+    color: [0.04, 0.04, 0.06, 0.95]
+    roughness: 0.7
+  IsolationTrench:
+    color: [0.10, 0.10, 0.14, 0.90]
+    roughness: 0.6
+  ShelfEtch:
+    color: [0.28, 0.30, 0.32, 0.8]
+    roughness: 0.5