def square2circle(cfg, square_color=(0.9, 0.1, 0.3, 1.0), circle_color=(1.0, 1.0, 1.0, 1.0)):
'''Morphing of a square (composed of many vertices) into a circle'''
cfg.duration = 5
cfg.aspect_ratio = (1, 1)
def sqxf(t): # square x coordinates clockwise starting top-left
if t < 1/4.: return t*4
if t < 1/2.: return 1
if t < 3/4.: return 1.-(t-.5)*4
return 0
def sqyf(t): # square y coordinates clockwise starting top-left
if t < 1/4.: return 1
if t < 1/2.: return 1.-(t-.25)*4
if t < 3/4.: return 0
return (t-.75)*4
n = 1024 # number of vertices
s = 1.25 # shapes scale
interp = 'exp_in_out'
center_vertex = [0, 0, 0]
square_vertices = array.array('f', center_vertex)
for i in range(n):
x = (sqxf(i / float(n)) - .5) * s
y = (sqyf(i / float(n)) - .5) * s
square_vertices.extend([x, y, 0])
circle_vertices = array.array('f', center_vertex)
step = 2 * math.pi / float(n)
for i in range(n):
angle = i * step - math.pi/4.
x = math.sin(angle) * .5 * s
y = math.cos(angle) * .5 * s
circle_vertices.extend([x, y, 0])
indices = array.array('H')
for i in range(1, n + 1):
indices.extend([0, i, i + 1])
indices[-1] = 1
vertices_animkf = [
ngl.AnimKeyFrameBuffer(0, square_vertices),
ngl.AnimKeyFrameBuffer(cfg.duration/2., circle_vertices, interp),
ngl.AnimKeyFrameBuffer(cfg.duration, square_vertices, interp),
]
vertices = ngl.AnimatedBufferVec3(vertices_animkf)
color_animkf = [
ngl.AnimKeyFrameVec4(0, square_color),
ngl.AnimKeyFrameVec4(cfg.duration/2., circle_color, interp),
ngl.AnimKeyFrameVec4(cfg.duration, square_color, interp),
]
ucolor = ngl.AnimatedVec4(color_animkf)
geom = ngl.Geometry(vertices, indices=ngl.BufferUShort(data=indices))
p = ngl.Program(vertex=cfg.get_vert('color'), fragment=cfg.get_frag('color'))
render = ngl.Render(geom, p)
render.update_frag_resources(color=ucolor)
return render
def _shape_geometry(cfg, set_normals=False, set_indices=False):
# Fake cube (3 faces only) obtained from:
# echo 'cube();'>x.scad; openscad x.scad -o x.stl
vertices = array.array('f', [x - 0.5 for x in [
1,1,0, 0,1,1, 1,1,1,
0,1,1, 1,1,0, 0,1,0,
0,0,0, 0,1,1, 0,1,0,
0,1,1, 0,0,0, 0,0,1,
0,1,1, 1,0,1, 1,1,1,
1,0,1, 0,1,1, 0,0,1,
]])
normals = array.array('f', [
0,1,0, 0,1,0, 0,1,0,
0,1,0, 0,1,0, 0,1,0,
-1,0,0, -1,0,0, -1,0,0,
-1,0,0, -1,0,0, -1,0,0,
0,0,1, 0,0,1, 0,0,1,
0,0,1, 0,0,1, 0,0,1,
])
vertices_buffer = ngl.BufferVec3(data=vertices)
normals_buffer = ngl.BufferVec3(data=normals)
cfg.aspect_ratio = (1, 1)
geometry = ngl.Geometry(vertices=vertices_buffer)
if set_normals:
geometry.set_normals(normals_buffer)
prog = ngl.Program(vertex=cfg.get_vert('colored-normals'), fragment=cfg.get_frag('colored-normals'))
prog.update_vert_out_vars(var_normal=ngl.IOVec3())
render = ngl.Render(geometry, prog)
else:
render = _render_shape(cfg, geometry, COLORS['magenta'])
if set_indices:
indices = array.array('H', list(range(3 * 6)))
indices_buffer = ngl.BufferUShort(data=indices)
geometry.set_indices(indices_buffer)
return ngl.Rotate(render, 45, axis=(1, 1, 1))
def cropboard(cfg, dim_clr=3, dim_cut=9):
cfg.duration = 5.0 + 1.0
nb_kf = 2
buffers = [
get_random_color_buffer(cfg.rng, dim_clr) for _ in range(nb_kf)
]
random_animkf = []
time_scale = cfg.duration / float(nb_kf)
for i, buf in enumerate(buffers + [buffers[0]]):
random_animkf.append(ngl.AnimKeyFrameBuffer(i * time_scale, buf))
random_buffer = ngl.AnimatedBufferVec4(keyframes=random_animkf)
random_tex = ngl.Texture2D(data_src=random_buffer,
width=dim_clr,
height=dim_clr)
kw = kh = 1.0 / dim_cut
qw = qh = 2.0 / dim_cut
p = ngl.Program(vertex=cfg.get_vert("cropboard"),
fragment=cfg.get_frag("texture"))
p.update_vert_out_vars(var_tex0_coord=ngl.IOVec2())
uv_offset_buffer = array.array("f")
translate_a_buffer = array.array("f")
translate_b_buffer = array.array("f")
if set_indices:
indices = array.array("H", [0, 2, 1, 1, 3, 0])
indices_buffer = ngl.BufferUShort(data=indices)
vertices = array.array(
"f",
[
# fmt: off
0,
0,
0,
qw,
qh,
0,
qw,
0,
0,
0,
qh,
0,
# fmt: on
],
)
uvcoords = array.array(
"f",
[
# fmt: off
0,
1.0,
kw,
1.0 - kh,
kw,
1.0,
0,
1.0 - kh,
# fmt: on
],
)
vertices_buffer = ngl.BufferVec3(data=vertices)
uvcoords_buffer = ngl.BufferVec2(data=uvcoords)
q = ngl.Geometry(vertices=vertices_buffer,
uvcoords=uvcoords_buffer,
indices=indices_buffer)
else:
q = ngl.Quad(
corner=(0, 0, 0),
width=(qw, 0, 0),
height=(0, qh, 0),
uv_corner=(0, 0),
uv_width=(kw, 0),
uv_height=(0, kh),
)
for y in range(dim_cut):
for x in range(dim_cut):
uv_offset = [x * kw, (y + 1.0) * kh - 1.0]
src = [cfg.rng.uniform(-2, 2), cfg.rng.uniform(-2, 2)]
dst = [x * qw - 1.0, 1.0 - (y + 1.0) * qh]
uv_offset_buffer.extend(uv_offset)
translate_a_buffer.extend(src)
translate_b_buffer.extend(dst)
utime_animkf = [
ngl.AnimKeyFrameFloat(0, 0),
ngl.AnimKeyFrameFloat(cfg.duration - 1.0, 1)
]
utime = ngl.AnimatedFloat(utime_animkf)
render = ngl.Render(q, p, nb_instances=dim_cut**2)
render.update_frag_resources(tex0=random_tex)
render.update_vert_resources(time=utime)
render.update_instance_attributes(
uv_offset=ngl.BufferVec2(data=uv_offset_buffer),
translate_a=ngl.BufferVec2(data=translate_a_buffer),
translate_b=ngl.BufferVec2(data=translate_b_buffer),
)
return render
def _shape_geometry(cfg, set_normals=False, set_indices=False):
# Fake cube (3 faces only) obtained from:
# echo 'cube();'>x.scad; openscad x.scad -o x.stl
vertices = array.array(
"f",
[
x - 0.5 for x in [
# fmt: off
1,
1,
0,
0,
1,
1,
1,
1,
1,
0,
1,
1,
1,
1,
0,
0,
1,
0,
0,
0,
0,
0,
1,
1,
0,
1,
0,
0,
1,
1,
0,
0,
0,
0,
0,
1,
0,
1,
1,
1,
0,
1,
1,
1,
1,
1,
0,
1,
0,
1,
1,
0,
0,
1,
# fmt: on
]
],
)
normals = array.array(
"f",
[
# fmt: off
0,
1,
0,
0,
1,
0,
0,
1,
0,
0,
1,
0,
0,
1,
0,
0,
1,
0,
-1,
0,
0,
-1,
0,
0,
-1,
0,
0,
-1,
0,
0,
-1,
0,
0,
-1,
0,
0,
0,
0,
1,
0,
0,
1,
0,
0,
1,
0,
0,
1,
0,
0,
1,
0,
0,
1,
# fmt: on
],
)
vertices_buffer = ngl.BufferVec3(data=vertices)
normals_buffer = ngl.BufferVec3(data=normals)
cfg.aspect_ratio = (1, 1)
geometry = ngl.Geometry(vertices=vertices_buffer)
if set_normals:
geometry.set_normals(normals_buffer)
prog = ngl.Program(vertex=cfg.get_vert("colored-normals"),
fragment=cfg.get_frag("colored-normals"))
prog.update_vert_out_vars(var_normal=ngl.IOVec3())
render = ngl.Render(geometry, prog)
else:
prog = ngl.Program(vertex=cfg.get_vert("color"),
fragment=cfg.get_frag("color"))
render = ngl.Render(geometry, prog)
render.update_frag_resources(
color=ngl.UniformVec3(value=COLORS.magenta),
opacity=ngl.UniformFloat(1))
if set_indices:
indices = array.array("H", list(range(3 * 6)))
indices_buffer = ngl.BufferUShort(data=indices)
geometry.set_indices(indices_buffer)
return ngl.Rotate(render, 45, axis=(1, 1, 1))
def cropboard(cfg, dim_clr=3, dim_cut=9):
cfg.duration = 5. + 1.
random.seed(0)
get_rand = lambda: array.array(
'f', [random.random() for i in range(dim_clr**2 * 3)])
nb_kf = 2
buffers = [get_rand() for i in range(nb_kf)]
random_animkf = []
time_scale = cfg.duration / float(nb_kf)
for i, buf in enumerate(buffers + [buffers[0]]):
random_animkf.append(ngl.AnimKeyFrameBuffer(i * time_scale, buf))
random_buffer = ngl.AnimatedBufferVec3(keyframes=random_animkf)
random_tex = ngl.Texture2D(data_src=random_buffer,
width=dim_clr,
height=dim_clr)
kw = kh = 1. / dim_cut
qw = qh = 2. / dim_cut
p = ngl.Program(vertex=cfg.get_vert('cropboard'),
fragment=cfg.get_frag('texture'))
uv_offset_buffer = array.array('f')
translate_a_buffer = array.array('f')
translate_b_buffer = array.array('f')
if set_indices:
indices = array.array('H', [0, 2, 1, 3])
indices_buffer = ngl.BufferUShort(data=indices)
vertices = array.array('f', [
0,
0,
0,
qw,
qh,
0,
qw,
0,
0,
0,
qh,
0,
])
uvcoords = array.array('f', [
0,
1.0,
kw,
1.0 - kh,
kw,
1.0,
0,
1.0 - kh,
])
vertices_buffer = ngl.BufferVec3(data=vertices)
uvcoords_buffer = ngl.BufferVec2(data=uvcoords)
q = ngl.Geometry(topology='triangle_fan',
vertices=vertices_buffer,
uvcoords=uvcoords_buffer,
indices=indices_buffer)
else:
q = ngl.Quad(corner=(0, 0, 0),
width=(qw, 0, 0),
height=(0, qh, 0),
uv_corner=(0, 0),
uv_width=(kw, 0),
uv_height=(0, kh))
for y in range(dim_cut):
for x in range(dim_cut):
uv_offset = [x * kw, (y + 1.) * kh - 1.]
src = [random.uniform(-2, 2), random.uniform(-2, 2)]
dst = [x * qw - 1., 1. - (y + 1.) * qh]
uv_offset_buffer.extend(uv_offset)
translate_a_buffer.extend(src)
translate_b_buffer.extend(dst)
utime_animkf = [
ngl.AnimKeyFrameFloat(0, 0),
ngl.AnimKeyFrameFloat(cfg.duration - 1., 1)
]
utime = ngl.AnimatedFloat(utime_animkf)
render = ngl.Render(q, p, nb_instances=dim_cut**2)
render.update_textures(tex0=random_tex)
render.update_uniforms(time=utime)
render.update_instance_attributes(
uv_offset=ngl.BufferVec2(data=uv_offset_buffer),
translate_a=ngl.BufferVec2(data=translate_a_buffer),
translate_b=ngl.BufferVec2(data=translate_b_buffer),
)
return render
