first commit

lib/extrude.py

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+import numpy as np
+import random
+from .sketch import Profile
+from .macro import *
+from .math_utils import cartesian2polar, polar2cartesian, polar_parameterization, polar_parameterization_inverse
+
+
+class CoordSystem(object):
+    """Local coordinate system for sketch plane."""
+    def __init__(self, origin, theta, phi, gamma, y_axis=None, is_numerical=False):
+        self.origin = origin
+        self._theta = theta # 0~pi
+        self._phi = phi     # -pi~pi
+        self._gamma = gamma # -pi~pi
+        self._y_axis = y_axis # (theta, phi)
+        self.is_numerical = is_numerical
+
+    @property
+    def normal(self):
+        return polar2cartesian([self._theta, self._phi])
+
+    @property
+    def x_axis(self):
+        normal_3d, x_axis_3d = polar_parameterization_inverse(self._theta, self._phi, self._gamma)
+        return x_axis_3d
+
+    @property
+    def y_axis(self):
+        if self._y_axis is None:
+            return np.cross(self.normal, self.x_axis)
+        return polar2cartesian(self._y_axis)
+
+    @staticmethod
+    def from_dict(stat):
+        origin = np.array([stat["origin"]["x"] * 1000, stat["origin"]["y"] * 1000, stat["origin"]["z"] * 1000])
+        normal_3d = np.array([stat["z_axis"]["x"], stat["z_axis"]["y"], stat["z_axis"]["z"]])
+        x_axis_3d = np.array([stat["x_axis"]["x"], stat["x_axis"]["y"], stat["x_axis"]["z"]])
+        y_axis_3d = np.array([stat["y_axis"]["x"], stat["y_axis"]["y"], stat["y_axis"]["z"]])
+        theta, phi, gamma = polar_parameterization(normal_3d, x_axis_3d)
+        return CoordSystem(origin, theta, phi, gamma, y_axis=cartesian2polar(y_axis_3d))
+
+    @staticmethod
+    def from_vector(vec, is_numerical=False, n=256):
+        origin = vec[:3]
+        theta, phi, gamma = vec[3:]
+        system = CoordSystem(origin, theta, phi, gamma)
+        if is_numerical:
+            system.denumericalize(n)
+        return system
+
+    def __str__(self):
+        return "origin: {}, normal: {}, x_axis: {}, y_axis: {}".format(
+            self.origin.round(4), self.normal.round(4), self.x_axis.round(4), self.y_axis.round(4))
+
+    def transform(self, translation, scale):
+        self.origin = (self.origin + translation) * scale
+
+    def numericalize(self, n=256):
+        """NOTE: shall only be called after normalization"""
+        # assert np.max(self.origin) <= 1.0 and np.min(self.origin) >= -1.0 # TODO: origin can be out-of-bound!
+        self.origin = ((self.origin + 1.0) / 2 * n).round().clip(min=0, max=n-1).astype(np.int)
+        tmp = np.array([self._theta, self._phi, self._gamma])
+        self._theta, self._phi, self._gamma = ((tmp / np.pi + 1.0) / 2 * n).round().clip(
+            min=0, max=n-1).astype(np.int)
+        self.is_numerical = True
+
+    def denumericalize(self, n=256):
+        self.origin = self.origin / n * 2 - 1.0
+        tmp = np.array([self._theta, self._phi, self._gamma])
+        self._theta, self._phi, self._gamma = (tmp / n * 2 - 1.0) * np.pi
+        self.is_numerical = False
+
+    def to_vector(self):
+        return np.array([*self.origin, self._theta, self._phi, self._gamma])
+
+
+class Extrude(object):
+    """Single extrude operation with corresponding a sketch profile.
+    NOTE: only support single sketch profile. Extrusion with multiple profiles is decomposed."""
+    def __init__(self, profile: Profile, sketch_plane: CoordSystem,
+                 operation, extent_type, extent_one, extent_two, sketch_pos, sketch_size):
+        """
+        Args:
+            profile (Profile): normalized sketch profile
+            sketch_plane (CoordSystem): coordinate system for sketch plane
+            operation (int): index of EXTRUDE_OPERATIONS, see macro.py
+            extent_type (int): index of EXTENT_TYPE, see macro.py
+            extent_one (float): extrude distance in normal direction (NOTE: it's negative in some data)
+            extent_two (float): extrude distance in opposite direction
+            sketch_pos (np.array): the global 3D position of sketch starting point
+            sketch_size (float): size of the sketch
+        """
+        self.profile = profile # normalized sketch
+        self.sketch_plane = sketch_plane
+        self.operation = operation
+        self.extent_type = extent_type
+        self.extent_one = extent_one
+        self.extent_two = extent_two
+
+        self.sketch_pos = sketch_pos
+        self.sketch_size = sketch_size
+
+    @staticmethod
+    def from_dict(all_stat, extrude_id, sketch_dim=256):
+        """construct Extrude from json data
+
+        Args:
+            all_stat (dict): all json data
+            extrude_id (str): entity ID for this extrude
+            sketch_dim (int, optional): sketch normalization size. Defaults to 256.
+
+        Returns:
+            list: one or more Extrude instances
+        """
+        extrude_entity = all_stat["entities"][extrude_id]
+        assert extrude_entity["start_extent"]["type"] == "ProfilePlaneStartDefinition"
+
+        all_skets = []
+        n = len(extrude_entity["profiles"])
+        for i in range(len(extrude_entity["profiles"])):
+            sket_id, profile_id = extrude_entity["profiles"][i]["sketch"], extrude_entity["profiles"][i]["profile"]
+            sket_entity = all_stat["entities"][sket_id]
+            sket_profile = Profile.from_dict(sket_entity["profiles"][profile_id])
+            sket_plane = CoordSystem.from_dict(sket_entity["transform"])
+            # normalize profile
+            #point = sket_profile.start_point
+            point = np.array([0.0,0.0,0.0])
+            sket_pos = point[0] * sket_plane.x_axis + point[1] * sket_plane.y_axis + sket_plane.origin
+            sket_size = sket_profile.bbox_size
+            sket_profile.normalize(sketch_dim)
+            all_skets.append((sket_profile, sket_plane, sket_pos, sket_size))
+
+        operation = EXTRUDE_OPERATIONS.index(extrude_entity["operation"])
+        extent_type = EXTENT_TYPE.index(extrude_entity["extent_type"])
+        extent_one = extrude_entity["extent_one"]["distance"]["value"] * 1000
+        extent_two = 0.0
+        if extrude_entity["extent_type"] == "TwoSidesFeatureExtentType":
+            extent_two = extrude_entity["extent_two"]["distance"]["value"] * 1000
+
+        if operation == EXTRUDE_OPERATIONS.index("NewBodyFeatureOperation"):
+            all_operations = [operation] + [EXTRUDE_OPERATIONS.index("JoinFeatureOperation")] * (n - 1)
+        else:
+            all_operations = [operation] * n
+
+        return [Extrude(all_skets[i][0], all_skets[i][1], all_operations[i], extent_type, extent_one, extent_two,
+                        all_skets[i][2], all_skets[i][3]) for i in range(n)]
+
+    @staticmethod
+    def from_vector(vec, is_numerical=False, n=256):
+        """vector representation: commands [SOL, ..., SOL, ..., EXT]"""
+        assert vec[-1][0] == EXT_IDX and vec[0][0] == SOL_IDX
+        profile_vec = np.concatenate([vec[:-1], EOS_VEC[np.newaxis]])
+        profile = Profile.from_vector(profile_vec, is_numerical=is_numerical)
+        ext_vec = vec[-1][-N_ARGS_EXT:]
+
+        sket_pos = ext_vec[N_ARGS_PLANE:N_ARGS_PLANE + 3]
+        sket_size = ext_vec[N_ARGS_PLANE + N_ARGS_TRANS - 1]
+        sket_plane = CoordSystem.from_vector(np.concatenate([sket_pos, ext_vec[:N_ARGS_PLANE]]))
+        ext_param = ext_vec[-N_ARGS_EXT_PARAM:]
+
+        res = Extrude(profile, sket_plane, int(ext_param[2]), int(ext_param[3]), ext_param[0], ext_param[1],
+                      sket_pos, sket_size)
+        if is_numerical:
+            res.denumericalize(n)
+        return res
+
+    def __str__(self):
+        s = "Sketch-Extrude pair:"
+        s += "\n  -" + str(self.sketch_plane)
+        s += "\n  -sketch position: {}, sketch size: {}".format(self.sketch_pos.round(4), self.sketch_size.round(4))
+        s += "\n  -operation:{}, type:{}, extent_one:{}, extent_two:{}".format(
+            self.operation, self.extent_type, self.extent_one.round(4), self.extent_two.round(4))
+        s += "\n  -" + str(self.profile)
+        return s
+
+    def transform(self, translation, scale):
+        """linear transformation"""
+        # self.profile.transform(np.array([0, 0]), scale)
+        self.sketch_plane.transform(translation, scale)
+        self.extent_one *= scale
+        self.extent_two *= scale
+        self.sketch_pos = (self.sketch_pos + translation) * scale
+        self.sketch_size *= scale
+
+    def numericalize(self, n=256):
+        """quantize the representation.
+        NOTE: shall only be called after CADSequence.normalize (the shape lies in unit cube, -1~1)"""
+        assert -2.0 <= self.extent_one <= 2.0 and -2.0 <= self.extent_two <= 2.0
+        self.profile.numericalize(n)
+        self.sketch_plane.numericalize(n)
+        self.extent_one = ((self.extent_one + 1.0) / 2 * n).round().clip(min=0, max=n-1).astype(np.int) 
+        self.extent_two = ((self.extent_two + 1.0) / 2 * n).round().clip(min=0, max=n-1).astype(np.int) 
+        self.operation = int(self.operation)
+        self.extent_type = int(self.extent_type)
+
+        self.sketch_pos = ((self.sketch_pos + 1.0) / 2 * n).round().clip(min=0, max=n-1).astype(np.int) 
+        self.sketch_size = (self.sketch_size / 2 * n).round().clip(min=0, max=n-1).astype(np.int) 
+
+    def denumericalize(self, n=256):
+        """de-quantize the representation."""
+        self.extent_one = self.extent_one / n * 2 - 1.0
+        self.extent_two = self.extent_two / n * 2 - 1.0
+        self.sketch_plane.denumericalize(n)
+        self.sketch_pos = self.sketch_pos / n * 2 - 1.0
+        self.sketch_size = self.sketch_size / n * 2
+
+        self.operation = self.operation
+        self.extent_type = self.extent_type
+
+    def flip_sketch(self, axis):
+        self.profile.flip(axis)
+        self.profile.normalize()
+
+    def to_vector(self, max_n_loops=6, max_len_loop=15, pad=True):
+        """vector representation: commands [SOL, ..., SOL, ..., EXT]"""
+        profile_vec = self.profile.to_vector(max_n_loops, max_len_loop, pad=False)
+        if profile_vec is None:
+            return None
+        sket_plane_orientation = self.sketch_plane.to_vector()[3:]
+        ext_param = list(sket_plane_orientation) + list(self.sketch_pos) + [self.sketch_size] + \
+                    [self.extent_one, self.extent_two, self.operation, self.extent_type]
+        ext_vec = np.array([EXT_IDX, *[PAD_VAL] * N_ARGS_SKETCH, *ext_param])
+        vec = np.concatenate([profile_vec[:-1], ext_vec[np.newaxis], profile_vec[-1:]], axis=0) # NOTE: last one is EOS
+        if pad:
+            pad_len = max_n_loops * max_len_loop - vec.shape[0]
+            vec = np.concatenate([vec, EOS_VEC[np.newaxis].repeat(pad_len, axis=0)], axis=0)
+        return vec
+
+
+class CADSequence(object):
+    """A CAD modeling sequence, a series of extrude operations."""
+    def __init__(self, extrude_seq, bbox=None):
+        self.seq = extrude_seq
+        self.bbox = bbox
+
+    @staticmethod
+    def from_dict(all_stat):
+        """construct CADSequence from json data"""
+        seq = []
+        for item in all_stat["sequence"]:
+            if item["type"] == "ExtrudeFeature":
+                extrude_ops = Extrude.from_dict(all_stat, item["entity"])
+                seq.extend(extrude_ops)
+        bbox_info = all_stat["properties"]["bounding_box"]
+        max_point = np.array([bbox_info["max_point"]["x"] * 1000, bbox_info["max_point"]["y"] * 1000, bbox_info["max_point"]["z"] * 1000])
+        min_point = np.array([bbox_info["min_point"]["x"] * 1000, bbox_info["min_point"]["y"] * 1000, bbox_info["min_point"]["z"] * 1000])
+        bbox = np.stack([max_point, min_point], axis=0)
+        return CADSequence(seq, bbox)
+
+    @staticmethod
+    def from_vector(vec, is_numerical=False, n=256):
+        commands = vec[:, 0]
+        ext_indices = [-1] + np.where(commands == EXT_IDX)[0].tolist()
+        ext_seq = []
+        for i in range(len(ext_indices) - 1):
+            start, end = ext_indices[i], ext_indices[i + 1]
+            ext_seq.append(Extrude.from_vector(vec[start+1:end+1], is_numerical, n))
+        cad_seq = CADSequence(ext_seq)
+        return cad_seq
+
+    def __str__(self):
+        return  "" + "\n".join(["({})".format(i) + str(ext) for i, ext in enumerate(self.seq)])
+
+    def to_vector(self, max_n_ext=10, max_n_loops=6, max_len_loop=15, max_total_len=60, pad=False):
+        if len(self.seq) > max_n_ext:
+            return None
+        vec_seq = []
+        for item in self.seq:
+            vec = item.to_vector(max_n_loops, max_len_loop, pad=False)
+            if vec is None:
+                return None
+            vec = vec[:-1] # last one is EOS, removed
+            vec_seq.append(vec)
+
+        vec_seq = np.concatenate(vec_seq, axis=0)
+        vec_seq = np.concatenate([vec_seq, EOS_VEC[np.newaxis]], axis=0)
+
+        # add EOS padding
+        if pad and vec_seq.shape[0] < max_total_len:
+            pad_len = max_total_len - vec_seq.shape[0]
+            vec_seq = np.concatenate([vec_seq, EOS_VEC[np.newaxis].repeat(pad_len, axis=0)], axis=0)
+
+        return vec_seq
+
+    def transform(self, translation, scale):
+        """linear transformation"""
+        for item in self.seq:
+            item.transform(translation, scale)
+
+    def normalize(self, size=1.0):
+        """(1)normalize the shape into unit cube (-1~1). """
+        scale = size * NORM_FACTOR / np.max(np.abs(self.bbox))
+        self.transform(0.0, scale)
+
+    def numericalize(self, n=256):
+        for item in self.seq:
+            item.numericalize(n)
+
+    def flip_sketch(self, axis):
+        for item in self.seq:
+            item.flip_sketch(axis)
+
+    def random_transform(self):
+        for item in self.seq:
+            # random transform sketch
+            scale = random.uniform(0.8, 1.2)
+            item.profile.transform(-np.array([128, 128]), scale)
+            translate = np.array([random.randint(-5, 5), random.randint(-5, 5)], dtype=np.int) + 128
+            item.profile.transform(translate, 1)
+
+            # random transform and scale extrusion
+            t = 0.05
+            translate = np.array([random.uniform(-t, t), random.uniform(-t, t), random.uniform(-t, t)])
+            scale = random.uniform(0.8, 1.2)
+            # item.sketch_plane.transform(translate, scale)
+            item.sketch_pos = (item.sketch_pos + translate) * scale
+            item.extent_one *= random.uniform(0.8, 1.2)
+            item.extent_two *= random.uniform(0.8, 1.2)
+
+    def random_flip_sketch(self):
+        for item in self.seq:
+            flip_idx = random.randint(0, 3)
+            if flip_idx > 0:
+                item.flip_sketch(['x', 'y', 'xy'][flip_idx - 1])