def __init__(
self,
vertices,
faces,
euler_init,
translation_init,
defaultColor,
defaultLight,
cregu=2000,
inertia=0.96,
damping=0.05,
updateLights=True,
updateColor=True,
):
self.cregu = cregu
self.inertia = inertia
self.damping = damping
self.step_factor_vertices = 0.0005
self.step_max_vertices = 0.5
self.step_factor_quaternion = 0.00006
self.step_max_quaternion = 0.05
self.step_factor_translation = 0.00005
self.step_max_translation = 0.1
self.defaultColor = defaultColor
self.defaultLight = defaultLight
self.updateLights = updateLights
self.updateColor = updateColor
self.mesh = TriMesh(faces[:, ::-1].copy())
objectCenter = vertices.mean(axis=0)
objectRadius = np.max(np.std(vertices, axis=0))
self.cameraCenter = objectCenter + np.array([0, 0, 9]) * objectRadius
self.scene = Scene3D()
self.scene.setMesh(self.mesh)
self.rigidEnergy = LaplacianRigidEnergy(self.mesh, vertices, cregu)
self.vertices_init = copy.copy(vertices)
self.Hfactorized = None
self.Hpreconditioner = None
self.setMeshTransformInit(euler=euler_init,
translation=translation_init)
self.reset()
def __init__(
self,
vertices,
faces,
euler_init,
translation_init,
cregu=2000,
inertia=0.96,
damping=0.05,
):
self.cregu = cregu
self.inertia = inertia
self.damping = damping
self.step_factor_vertices = 0.0005
self.step_max_vertices = 0.5
self.step_factor_quaternion = 0.00006
self.step_max_quaternion = 0.1
self.step_factor_translation = 0.00005
self.step_max_translation = 0.1
self.mesh = TriMesh(faces[:, ::-1].copy(
)) # we do a copy to avoid negative stride not support by pytorch
objectCenter = vertices.mean(axis=0)
objectRadius = np.max(np.std(vertices, axis=0))
self.cameraCenter = objectCenter + np.array([-0.5, 0, 5
]) * objectRadius
self.scene = Scene3D()
self.scene.setMesh(self.mesh)
self.rigidEnergy = LaplacianRigidEnergy(self.mesh, vertices, cregu)
self.vertices_init = copy.copy(vertices)
self.Hfactorized = None
self.Hpreconditioner = None
self.setMeshTransformInit(euler=euler_init,
translation=translation_init)
self.reset()
class MeshRGBFitterWithPose:
def __init__(
self,
vertices,
faces,
euler_init,
translation_init,
defaultColor,
defaultLight,
cregu=2000,
inertia=0.96,
damping=0.05,
updateLights=True,
updateColor=True,
):
self.cregu = cregu
self.inertia = inertia
self.damping = damping
self.step_factor_vertices = 0.0005
self.step_max_vertices = 0.5
self.step_factor_quaternion = 0.00006
self.step_max_quaternion = 0.05
self.step_factor_translation = 0.00005
self.step_max_translation = 0.1
self.defaultColor = defaultColor
self.defaultLight = defaultLight
self.updateLights = updateLights
self.updateColor = updateColor
self.mesh = TriMesh(faces[:, ::-1].copy())
objectCenter = vertices.mean(axis=0)
objectRadius = np.max(np.std(vertices, axis=0))
self.cameraCenter = objectCenter + np.array([0, 0, 9]) * objectRadius
self.scene = Scene3D()
self.scene.setMesh(self.mesh)
self.rigidEnergy = LaplacianRigidEnergy(self.mesh, vertices, cregu)
self.vertices_init = copy.copy(vertices)
self.Hfactorized = None
self.Hpreconditioner = None
self.setMeshTransformInit(euler=euler_init,
translation=translation_init)
self.reset()
def setBackgroundColor(self, backgroundColor):
self.scene.setBackground(
np.tile(backgroundColor[None, None, :],
(self.SizeH, self.SizeW, 1)))
def setMeshTransformInit(self, euler, translation):
self.transformQuaternionInit = scipy.spatial.transform.Rotation.from_euler(
"zyx", euler).as_quat()
self.transformTranslationInit = translation
def reset(self):
self.vertices = copy.copy(self.vertices_init)
self.speed_vertices = np.zeros(self.vertices.shape)
self.transformQuaternion = copy.copy(self.transformQuaternionInit)
self.transformTranslation = copy.copy(self.transformTranslationInit)
self.speed_translation = np.zeros(3)
self.speed_quaternion = np.zeros(4)
self.handColor = copy.copy(self.defaultColor)
self.ligthDirectional = copy.copy(self.defaultLight["directional"])
self.ambiantLight = copy.copy(self.defaultLight["ambiant"])
self.speed_ligthDirectional = np.zeros(self.ligthDirectional.shape)
self.speed_ambiantLight = np.zeros(self.ambiantLight.shape)
self.speed_handColor = np.zeros(self.handColor.shape)
def setImage(self, handImage, focal=None):
self.SizeW = handImage.shape[1]
self.SizeH = handImage.shape[0]
assert handImage.ndim == 3
self.handImage = handImage
if focal is None:
focal = 2 * self.SizeW
R = np.array([[1, 0, 0], [0, -1, 0], [0, 0, -1]])
T = -R.T.dot(self.cameraCenter)
self.CameraMatrix = np.array([[focal, 0, self.SizeW / 2],
[0, focal, self.SizeH / 2],
[0, 0, 1]]).dot(np.column_stack((R, T)))
self.iter = 0
def render(self):
q_normalized = normalize(
self.transformQuaternion
) # that will lead to a gradient that is in the tangeant space
vertices_transformed = (qrot(q_normalized, self.vertices) +
self.transformTranslation)
self.mesh.setVertices(vertices_transformed)
self.scene.setLight(ligthDirectional=self.ligthDirectional,
ambiantLight=self.ambiantLight)
self.mesh.setVerticesColors(np.tile(self.handColor,
(self.mesh.nbV, 1)))
Abuffer = self.scene.render(self.CameraMatrix,
resolution=(self.SizeW, self.SizeH))
return Abuffer
def render_backward(self, Abuffer_b):
self.scene.clear_gradients()
self.scene.render_backward(Abuffer_b)
self.handColor_b = np.sum(self.mesh.verticesColors_b, axis=0)
self.ligthDirectional_b = self.scene.lightDirectional_b
self.ambiantLight_b = self.scene.ambiantLight_b
vertices_transformed_b = self.scene.mesh.vertices_b
self.transformTranslation_b = np.sum(vertices_transformed_b, axis=0)
q_normalized = normalize(self.transformQuaternion)
q_normalized_b, self.vertices_b = qrot_backward(
q_normalized, self.vertices, vertices_transformed_b)
self.transformQuaternion_b = normalize_backward(
self.transformQuaternion, q_normalized_b
) # that will lead to a gradient that is in the tangeant space
return
def step(self):
self.vertices = self.vertices - np.mean(self.vertices, axis=0)[None, :]
Abuffer = self.render()
diffImage = np.sum((Abuffer - self.handImage)**2, axis=2)
Abuffer_b = 2 * (Abuffer - self.handImage)
EData = np.sum(diffImage)
E_rigid, grad_rigidity, approx_hessian_rigidity = self.rigidEnergy.eval(
self.vertices)
Energy = EData + E_rigid
print("Energy=%f : EData=%f E_rigid=%f" % (Energy, EData, E_rigid))
self.render_backward(Abuffer_b)
self.vertices_b = self.vertices_b - np.mean(self.vertices_b,
axis=0)[None, :]
# update v
G = self.vertices_b + grad_rigidity
def mult_and_clamp(x, a, t):
return np.minimum(np.maximum(x * a, -t), t)
inertia = self.inertia
# update vertices
step_vertices = mult_and_clamp(-G, self.step_factor_vertices,
self.step_max_vertices)
self.speed_vertices = (1 -
self.damping) * (self.speed_vertices * inertia +
(1 - inertia) * step_vertices)
self.vertices = self.vertices + self.speed_vertices
# update rotation
step_quaternion = mult_and_clamp(
-self.transformQuaternion_b,
self.step_factor_quaternion,
self.step_max_quaternion,
)
self.speed_quaternion = (1 - self.damping) * (
self.speed_quaternion * inertia + (1 - inertia) * step_quaternion)
self.transformQuaternion = self.transformQuaternion + self.speed_quaternion
self.transformQuaternion = self.transformQuaternion / np.linalg.norm(
self.transformQuaternion)
# update translation
step_translation = mult_and_clamp(
-self.transformTranslation_b,
self.step_factor_translation,
self.step_max_translation,
)
self.speed_translation = (
1 - self.damping) * (self.speed_translation * inertia +
(1 - inertia) * step_translation)
self.transformTranslation = self.transformTranslation + self.speed_translation
# update directional light
step = -self.ligthDirectional_b * 0.0001
self.speed_ligthDirectional = (1 - self.damping) * (
self.speed_ligthDirectional * inertia + (1 - inertia) * step)
self.ligthDirectional = self.ligthDirectional + self.speed_ligthDirectional
# update ambiant light
step = -self.ambiantLight_b * 0.0001
self.speed_ambiantLight = (1 - self.damping) * (
self.speed_ambiantLight * inertia + (1 - inertia) * step)
self.ambiantLight = self.ambiantLight + self.speed_ambiantLight
# update hand color
step = -self.handColor_b * 0.00001
self.speed_handColor = (1 - self.damping) * (
self.speed_handColor * inertia + (1 - inertia) * step)
self.handColor = self.handColor + self.speed_handColor
self.iter += 1
return Energy, Abuffer, diffImage
class MeshDepthFitter:
def __init__(
self,
vertices,
faces,
euler_init,
translation_init,
cregu=2000,
inertia=0.96,
damping=0.05,
):
self.cregu = cregu
self.inertia = inertia
self.damping = damping
self.step_factor_vertices = 0.0005
self.step_max_vertices = 0.5
self.step_factor_quaternion = 0.00006
self.step_max_quaternion = 0.1
self.step_factor_translation = 0.00005
self.step_max_translation = 0.1
self.mesh = TriMesh(faces[:, ::-1].copy(
)) # we do a copy to avoid negative stride not support by pytorch
objectCenter = vertices.mean(axis=0)
objectRadius = np.max(np.std(vertices, axis=0))
self.cameraCenter = objectCenter + np.array([-0.5, 0, 5
]) * objectRadius
self.scene = Scene3D()
self.scene.setMesh(self.mesh)
self.rigidEnergy = LaplacianRigidEnergy(self.mesh, vertices, cregu)
self.vertices_init = copy.copy(vertices)
self.Hfactorized = None
self.Hpreconditioner = None
self.setMeshTransformInit(euler=euler_init,
translation=translation_init)
self.reset()
def setMeshTransformInit(self, euler, translation):
self.transformQuaternionInit = scipy.spatial.transform.Rotation.from_euler(
"zyx", euler).as_quat()
self.transformTranslationInit = translation
def reset(self):
self.vertices = copy.copy(self.vertices_init)
self.speed_vertices = np.zeros(self.vertices_init.shape)
self.transformQuaternion = copy.copy(self.transformQuaternionInit)
self.transformTranslation = copy.copy(self.transformTranslationInit)
self.speed_translation = np.zeros(3)
self.speed_quaternion = np.zeros(4)
def setMaxDepth(self, maxDepth):
self.scene.maxDepth = maxDepth
self.scene.setBackground(
np.full((self.SizeH, self.SizeW, 1), maxDepth, dtype=np.float))
def setDepthScale(self, depthScale):
self.depthScale = depthScale
def setImage(self, handImage, focal=None):
self.SizeW = handImage.shape[1]
self.SizeH = handImage.shape[0]
assert handImage.ndim == 2
self.handImage = handImage
if focal is None:
focal = 2 * self.SizeW
R = np.array([[1, 0, 0], [0, -1, 0], [0, 0, -1]])
T = -R.T.dot(self.cameraCenter)
self.CameraMatrix = np.array([[focal, 0, self.SizeW / 2],
[0, focal, self.SizeH / 2],
[0, 0, 1]]).dot(np.column_stack((R, T)))
self.iter = 0
def render(self):
q_normalized = normalize(
self.transformQuaternion
) # that will lead to a gradient that is in the tangeant space
vertices_transformed = (qrot(q_normalized, self.vertices) +
self.transformTranslation)
self.mesh.setVertices(vertices_transformed)
self.DepthNotCliped = self.scene.renderDepth(
self.CameraMatrix,
resolution=(self.SizeW, self.SizeH),
depth_scale=self.depthScale,
)
Depth = np.clip(self.DepthNotCliped, 0, self.scene.maxDepth)
return Depth
def render_backward(self, Depth_b):
self.scene.clear_gradients()
Depth_b[self.DepthNotCliped < 0] = 0
Depth_b[self.DepthNotCliped > self.scene.maxDepth] = 0
self.scene.renderDepth_backward(Depth_b)
vertices_transformed_b = self.scene.mesh.vertices_b
self.transformTranslation_b = np.sum(vertices_transformed_b, axis=0)
q_normalized = normalize(self.transformQuaternion)
q_normalized_b, self.vertices_b = qrot_backward(
q_normalized, self.vertices, vertices_transformed_b)
self.transformQuaternion_b = normalize_backward(
self.transformQuaternion, q_normalized_b
) # that will lead to a gradient that is in the tangeant space
return
def step(self):
self.vertices = self.vertices - np.mean(self.vertices, axis=0)[None, :]
Depth = self.render()
diffImage = np.sum((Depth - self.handImage[:, :, None])**2, axis=2)
EData = np.sum(diffImage)
Depth_b = 2 * (Depth - self.handImage[:, :, None])
self.render_backward(Depth_b)
self.vertices_b = self.vertices_b - np.mean(self.vertices_b,
axis=0)[None, :]
GradData = self.vertices_b
# update v
E_rigid, grad_rigidity, approx_hessian_rigidity = self.rigidEnergy.eval(
self.vertices)
Energy = EData + E_rigid
print("Energy=%f : EData=%f E_rigid=%f" % (Energy, EData, E_rigid))
# update v
G = GradData + grad_rigidity
def mult_and_clamp(x, a, t):
return np.minimum(np.maximum(x * a, -t), t)
inertia = self.inertia
# update vertices
step_vertices = mult_and_clamp(-G, self.step_factor_vertices,
self.step_max_vertices)
self.speed_vertices = (
1 - self.damping) * (self.speed_vertices * self.inertia +
(1 - self.inertia) * step_vertices)
self.vertices = self.vertices + self.speed_vertices
# update rotation
step_quaternion = mult_and_clamp(
-self.transformQuaternion_b,
self.step_factor_quaternion,
self.step_max_quaternion,
)
self.speed_quaternion = (1 - self.damping) * (
self.speed_quaternion * inertia + (1 - inertia) * step_quaternion)
self.transformQuaternion = self.transformQuaternion + self.speed_quaternion
self.transformQuaternion = self.transformQuaternion / np.linalg.norm(
self.transformQuaternion)
# update translation
step_translation = mult_and_clamp(
-self.transformTranslation_b,
self.step_factor_translation,
self.step_max_translation,
)
self.speed_translation = (
1 - self.damping) * (self.speed_translation * inertia +
(1 - inertia) * step_translation)
self.transformTranslation = self.transformTranslation + self.speed_translation
self.iter += 1
return Energy, Depth[:, :, 0], diffImage