def main():
# Build the scene geometry, which is just an axis-aligned cube centred at the origin in world space
# We replicate vertices that are shared, so normals are effectively per-face instead of smoothed
cube_vertices_object, cube_faces = build_cube()
cube_vertices_object = tf.constant(cube_vertices_object, dtype=tf.float32)
cube_vertices_object, cube_faces = lighting.split_vertices_by_face(
cube_vertices_object, cube_faces)
cube_vertex_colors = tf.ones_like(cube_vertices_object)
# Convert vertices to homogeneous coordinates
cube_vertices_object = tf.concat(
[cube_vertices_object,
tf.ones_like(cube_vertices_object[:, -1:])],
axis=1)
# Transform vertices from object to world space, by rotating around the vertical axis
cube_vertices_world = tf.matmul(cube_vertices_object,
matrices.rodrigues([0., 0.5, 0.]))
# Calculate face normals; pre_split implies that no faces share a vertex
cube_normals_world = lighting.vertex_normals_pre_split(
cube_vertices_world, cube_faces)
# Transform vertices from world to camera space; note that the camera points along the negative-z axis in camera space
view_matrix = matrices.compose(
matrices.translation([0., -1.5,
-3.5]), # translate it away from the camera
matrices.rodrigues([-0.3, 0., 0.]) # tilt the view downwards
)
cube_vertices_camera = tf.matmul(cube_vertices_world, view_matrix)
# Transform vertices from camera to clip space
projection_matrix = matrices.perspective_projection(
near=0.1, far=20., right=0.1, aspect=float(frame_height) / frame_width)
cube_vertices_clip = tf.matmul(cube_vertices_camera, projection_matrix)
# Calculate lighting, as combination of diffuse and ambient
vertex_colors_lit = lighting.diffuse_directional(
cube_normals_world,
cube_vertex_colors,
light_direction=[1., 0., 0.],
light_color=[1., 1., 1.]) * 0.8 + cube_vertex_colors * 0.2
pixels = dirt.rasterise(vertices=cube_vertices_clip,
faces=cube_faces,
vertex_colors=vertex_colors_lit,
background=tf.zeros([frame_height, frame_width,
3]),
width=frame_width,
height=frame_height,
channels=3)
session = tf.Session()
with session.as_default():
pixels_eval = pixels.eval()
cv2.imshow('simple.py', pixels_eval[:, :, (2, 1, 0)])
cv2.waitKey(0)
def get_transformed_geometry(translation, rotation, scale):
# Build bent square in object space, on z = 0 plane
vertices_object = tf.constant(
[[-1, -1, 0.], [-1, 1, 0], [1, 1, 0], [1, -1, -1.3]],
dtype=tf.float32) * square_size / 2
faces = [[0, 1, 2], [0, 2, 3]]
# ** we should add an occluding triangle!
# ** also a non-planar meeting-of-faces
vertices_object, faces = lighting.split_vertices_by_face(
vertices_object, faces)
# Convert vertices to homogeneous coordinates
vertices_object = tf.concat(
[vertices_object,
tf.ones_like(vertices_object[:, -1:])], axis=1)
# Transform vertices from object to world space, by rotating around the z-axis
vertices_world = tf.matmul(
vertices_object, matrices.rodrigues(
[0., 0., rotation])) * scale + tf.concat([translation, [0.]],
axis=0)
# Calculate face normals
normals_world = lighting.vertex_normals(vertices_world, faces)
# Transform vertices from world to camera space; note that the camera points along the negative-z axis in camera space
view_matrix = matrices.translation([-0.5, 0., -3.5
]) # translate it away from the camera
vertices_camera = tf.matmul(vertices_world, view_matrix)
# Transform vertices from camera to clip space
projection_matrix = matrices.perspective_projection(
near=0.1,
far=20.,
right=0.1,
aspect=float(canvas_height) / canvas_width)
vertices_clip = tf.matmul(vertices_camera, projection_matrix)
vertex_colours = tf.concat(
[tf.ones([3, 3]) * [0.8, 0.5, 0.],
tf.ones([3, 3]) * [0.5, 0.8, 0.]],
axis=0)
return vertices_clip, faces, normals_world, vertex_colours
def main():
# Build the scene geometry, which is just an axis-aligned cube centred at the origin in world space
# We replicate vertices that are shared, so normals are effectively per-face instead of smoothed
cube_vertices_object, cube_faces = build_cube()
cube_vertices_object = tf.constant(cube_vertices_object, dtype=tf.float32)
cube_vertices_object, cube_faces = lighting.split_vertices_by_face(cube_vertices_object, cube_faces)
cube_vertex_colors = tf.ones_like(cube_vertices_object)
# Convert vertices to homogeneous coordinates
cube_vertices_object = tf.concat([
cube_vertices_object,
tf.ones_like(cube_vertices_object[:, -1:])
], axis=1)
# Transform vertices from object to world space, by rotating around the vertical axis
cube_vertices_world = tf.matmul(cube_vertices_object, matrices.rodrigues([0., 0.5, 0.]))
# Calculate face normals; pre_split implies that no faces share a vertex
cube_normals_world = lighting.vertex_normals_pre_split(cube_vertices_world, cube_faces)
# Transform vertices from world to camera space; note that the camera points along the negative-z axis in camera space
view_matrix = matrices.compose(
matrices.translation([0., -1.5, -3.5]), # translate it away from the camera
matrices.rodrigues([-0.3, 0., 0.]) # tilt the view downwards
)
cube_vertices_camera = tf.matmul(cube_vertices_world, view_matrix)
# Transform vertices from camera to clip space
projection_matrix = matrices.perspective_projection(near=0.1, far=20., right=0.1, aspect=float(frame_height) / frame_width)
cube_vertices_clip = tf.matmul(cube_vertices_camera, projection_matrix)
# The following function is applied to the G-buffer, which is a multi-channel image containing all the vertex attributes.
# It uses this to calculate the shading at each pixel, hence their final intensities
def shader_fn(gbuffer, view_matrix, light_direction):
# Unpack the different attributes from the G-buffer
mask = gbuffer[:, :, :1]
positions = gbuffer[:, :, 1:4]
unlit_colors = gbuffer[:, :, 4:7]
normals = gbuffer[:, :, 7:]
# Calculate a simple grey ambient lighting component
ambient_contribution = unlit_colors * [0.2, 0.2, 0.2]
# Calculate a red diffuse (Lambertian) lighting component
diffuse_contribution = lighting.diffuse_directional(
tf.reshape(normals, [-1, 3]),
tf.reshape(unlit_colors, [-1, 3]),
light_direction, light_color=[1., 0., 0.], double_sided=False
)
diffuse_contribution = tf.reshape(diffuse_contribution, [frame_height, frame_width, 3])
# Calculate a white specular (Phong) lighting component
camera_position_world = tf.linalg.inv(view_matrix)[3, :3]
specular_contribution = lighting.specular_directional(
tf.reshape(positions, [-1, 3]),
tf.reshape(normals, [-1, 3]),
tf.reshape(unlit_colors, [-1, 3]),
light_direction, light_color=[1., 1., 1.],
camera_position=camera_position_world,
shininess=6., double_sided=False
)
specular_contribution = tf.reshape(specular_contribution, [frame_height, frame_width, 3])
# The final pixel intensities inside the shape are given by combining the three lighting components;
# outside the shape, they are set to a uniform background color. We clip the final values as the specular
# component saturates some pixels
pixels = tf.clip_by_value(
(diffuse_contribution + specular_contribution + ambient_contribution) * mask + [0., 0., 0.3] * (1. - mask),
0., 1.
)
return pixels
# Render the G-buffer channels (mask, vertex positions, vertex colours, and normals at each pixel), then perform
# the deferred shading calculation. In general, any tensor required by shader_fn and wrt which we need derivatives
# should be included in shader_additional_inputs; although in this example they are constant, we pass the view
# matrix and lighting direction through this route as an illustration
light_direction = tf.linalg.l2_normalize([1., -0.3, -0.5])
pixels = dirt.rasterise_deferred(
vertices=cube_vertices_clip,
vertex_attributes=tf.concat([
tf.ones_like(cube_vertices_object[:, :1]), # mask
cube_vertices_world[:, :3], # vertex positions
cube_vertex_colors, # vertex colors
cube_normals_world # normals
], axis=1),
faces=cube_faces,
background_attributes=tf.zeros([frame_height, frame_width, 10]),
shader_fn=shader_fn,
shader_additional_inputs=[view_matrix, light_direction]
)
pixels = tf.cast(pixels * 255, tf.uint8)
session = tf.compat.v1.Session(config=tf.compat.v1.ConfigProto(gpu_options=tf.compat.v1.GPUOptions(allow_growth=True)))
with session.as_default():
image = pixels
img = Image.fromarray( np.asarray(image))
img.save("test_def.png")
def main():
# Build the scene geometry, which is just an axis-aligned cube centred at the origin in world space
# We replicate vertices that are shared, so normals are effectively per-face instead of smoothed
cube_vertices_object, cube_faces = build_cube()
cube_vertices_object = tf.constant(cube_vertices_object, dtype=tf.float32)
cube_vertices_object, cube_faces = lighting.split_vertices_by_face(
cube_vertices_object, cube_faces)
cube_vertex_colors = tf.ones_like(cube_vertices_object)
# Convert vertices to homogeneous coordinates
cube_vertices_object = tf.concat(
[cube_vertices_object,
tf.ones_like(cube_vertices_object[:, -1:])],
axis=1)
# Transform vertices from object to world space, by rotating around the vertical axis
cube_vertices_world = tf.matmul(cube_vertices_object,
matrices.rodrigues([0., 0.5, 0.]))
# Calculate face normals; pre_split implies that no faces share a vertex
cube_normals_world = lighting.vertex_normals_pre_split(
cube_vertices_world, cube_faces)
# Transform vertices from world to camera space; note that the camera points along the negative-z axis in camera space
view_matrix = matrices.compose(
matrices.translation([0., -1.5,
-3.5]), # translate it away from the camera
matrices.rodrigues([-0.3, 0., 0.]) # tilt the view downwards
)
cube_vertices_camera = tf.matmul(cube_vertices_world, view_matrix)
# Transform vertices from camera to clip space
projection_matrix = matrices.perspective_projection(
near=0.1, far=20., right=0.1, aspect=float(frame_height) / frame_width)
cube_vertices_clip = tf.matmul(cube_vertices_camera, projection_matrix)
# Render the G-buffer channels (vertex position, colour and normal at each pixel) needed for deferred shading
gbuffer_vertex_positions_world = dirt.rasterise(
vertices=cube_vertices_clip,
faces=cube_faces,
vertex_colors=cube_vertices_world[:, :3],
background=tf.ones([frame_height, frame_width, 3]) * float('-inf'),
width=frame_width,
height=frame_height,
channels=3)
gbuffer_vertex_colours_world = dirt.rasterise(
vertices=cube_vertices_clip,
faces=cube_faces,
vertex_colors=cube_vertex_colors,
background=tf.zeros([frame_height, frame_width, 3]),
width=frame_width,
height=frame_height,
channels=3)
gbuffer_vertex_normals_world = dirt.rasterise(
vertices=cube_vertices_clip,
faces=cube_faces,
vertex_colors=cube_normals_world,
background=tf.ones([frame_height, frame_width, 3]) * float('-inf'),
width=frame_width,
height=frame_height,
channels=3)
# Dilate the position and normal channels at the silhouette boundary; this doesn't affect the image, but
# ensures correct gradients for pixels just outside the silhouette
background_mask = tf.cast(
tf.equal(gbuffer_vertex_positions_world, float('-inf')), tf.float32)
gbuffer_vertex_positions_world_dilated = tf.nn.max_pool(
gbuffer_vertex_positions_world[None, ...],
ksize=[1, 3, 3, 1],
strides=[1, 1, 1, 1],
padding='SAME')[0]
gbuffer_vertex_positions_world = gbuffer_vertex_positions_world * (
1. - background_mask
) + gbuffer_vertex_positions_world_dilated * background_mask
gbuffer_vertex_normals_world_dilated = tf.nn.max_pool(
gbuffer_vertex_normals_world[None, ...],
ksize=[1, 3, 3, 1],
strides=[1, 1, 1, 1],
padding='SAME')[0]
gbuffer_vertex_normals_world = gbuffer_vertex_normals_world * (
1. - background_mask
) + gbuffer_vertex_normals_world_dilated * background_mask
# Calculate a simple grey ambient lighting component
ambient_contribution = gbuffer_vertex_colours_world * [0.2, 0.2, 0.2]
# Calculate a red diffuse (Lambertian) lighting component
light_direction = unit([1., -0.3, -0.5])
diffuse_contribution = lighting.diffuse_directional(
tf.reshape(gbuffer_vertex_normals_world, [-1, 3]),
tf.reshape(gbuffer_vertex_colours_world, [-1, 3]),
light_direction,
light_color=[1., 0., 0.],
double_sided=False)
diffuse_contribution = tf.reshape(diffuse_contribution,
[frame_height, frame_width, 3])
# Calculate a white specular (Phong) lighting component
camera_position_world = tf.matrix_inverse(view_matrix)[3, :3]
specular_contribution = lighting.specular_directional(
tf.reshape(gbuffer_vertex_positions_world, [-1, 3]),
tf.reshape(gbuffer_vertex_normals_world, [-1, 3]),
tf.reshape(gbuffer_vertex_colours_world, [-1, 3]),
light_direction,
light_color=[1., 1., 1.],
camera_position=camera_position_world,
shininess=6.,
double_sided=False)
specular_contribution = tf.reshape(specular_contribution,
[frame_height, frame_width, 3])
# Final pixels are given by combining ambient, diffuse, and specular components
pixels = diffuse_contribution + specular_contribution + ambient_contribution
session = tf.Session()
with session.as_default():
pixels_eval = pixels.eval()
cv2.imshow('deferred.py', pixels_eval[:, :, (2, 1, 0)])
cv2.waitKey(0)
def __call__(self,
verts,
trans,
cam=None,
img=None,
do_alpha=False,
far=None,
near=None,
color_id=0,
img_size=None,
seg_parts=13774):
"""
cam is 3D [f, px, py]
"""
'''if img is not None:
h, w = img.shape[:2]
elif img_size is not None:
h = img_size[0]
w = img_size[1]
else:
h = self.h
w = self.w
if cam is None:
cam = [self.flength, w / 2., h / 2.]
use_cam = ProjectPoints(
f=cam[0] * np.ones(2),
rt=np.zeros(3),
t=np.zeros(3),
k=np.zeros(5),
c=cam[1:3])
if near is None:
near = np.maximum(np.min(verts[:, 2]) - 25, 0.1)
if far is None:
far = np.maximum(np.max(verts[:, 2]) + 25, 25)
imtmp = render_model(
verts,
self.faces,
w,
h,
use_cam,
do_alpha=do_alpha,
img=img,
far=far,
near=near,
color_id=color_id)'''
#print (self.textura.shape)
frame_width, frame_height = self.w, self.h
cube_vertices_object = verts[0,:,:]
cube_faces = tf.constant(self.faces,dtype=tf.int64)
#cube_vertices_object = tf.constant(cube_vertices_object, dtype=tf.float32)
cube_vertices_object, cube_faces = lighting.split_vertices_by_face(cube_vertices_object, cube_faces)
#cube_vertex_colors = tf.ones_like(cube_vertices_object)
cube_vertex_colors = tf.constant(self.textura,dtype=tf.float32)
# Convert vertices to homogeneous coordinates
cube_vertices_object = tf.concat([cube_vertices_object,tf.ones_like(cube_vertices_object[:, -1:])], axis=1)
# Transform vertices from object to world space, by rotating around the vertical axis
# Calculate face normals; pre_split implies that no faces share a vertex
cube_normals_world = lighting.vertex_normals_pre_split(cube_vertices_object, cube_faces)
# Transform vertices from world to camera space; note that the camera points along the negative-z axis in camera space
view_matrix = matrices.translation(trans)
cube_vertices_world = tf.matmul(cube_vertices_object, view_matrix)
cube_vertices_camera = tf.matmul(cube_vertices_world, matrices.rodrigues([np.pi, 0.0, 0.]))
# Transform vertices from camera to clip space
projection_matrix = matrices.perspective_projection(near=self.near, far=self.far, right=self.right, aspect=float(frame_height) / frame_width)
cube_vertices_clip = tf.matmul(cube_vertices_camera, projection_matrix)
# Calculate lighting, as combination of diffuse and ambient
#vertex_colors_lit = lighting.diffuse_directional(
# cube_normals_world, cube_vertex_colors,
# light_direction=[1., 0., 0.], light_color=[1., 1., 1.]
#) * 0.8 + cube_vertex_colors * 0.2
#2987 seg_parts
pixels = dirt.rasterise(
vertices=cube_vertices_clip,
faces=cube_faces[:seg_parts,:],
vertex_colors=cube_vertex_colors,
background=tf.zeros([frame_height, frame_width, 3]),
width=frame_width, height=frame_height, channels=3
)
return pixels #,cube_vertices_object, cube_faces# use this to dum color