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66c9c8a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 | # Copyright (c) 2023 NVIDIA CORPORATION. All rights reserved.
# NVIDIA CORPORATION and its licensors retain all intellectual property
# and proprietary rights in and to this software, related documentation
# and any modifications thereto. Any use, reproduction, disclosure or
# distribution of this software and related documentation without an express
# license agreement from NVIDIA CORPORATION is strictly prohibited.
"""Sample node generating a procedural volume."""
import traceback
import omni.graph.core as og
import warp as wp
import omni.warp.nodes
from omni.warp.nodes.ogn.OgnSampleProceduralVolumeDatabase import OgnSampleProceduralVolumeDatabase
MIN_RES = 8
PROFILING = False
# Kernels
# ------------------------------------------------------------------------------
@wp.func
def sdf_create_box(pos: wp.vec3, size: wp.vec3):
"""Creates a SDF box primitive."""
# https://iquilezles.org/articles/distfunctions
q = wp.vec3(
wp.abs(pos[0]) - size[0],
wp.abs(pos[1]) - size[1],
wp.abs(pos[2]) - size[2],
)
qp = wp.vec3(wp.max(q[0], 0.0), wp.max(q[1], 0.0), wp.max(q[2], 0.0))
return wp.length(qp) + wp.min(wp.max(q[0], wp.max(q[1], q[2])), 0.0)
@wp.func
def sdf_create_torus(pos: wp.vec3, major_radius: float, minor_radius: float):
"""Creates a SDF torus primitive."""
# https://iquilezles.org/articles/distfunctions
q = wp.vec2(wp.length(wp.vec2(pos[0], pos[2])) - major_radius, pos[1])
return wp.length(q) - minor_radius
@wp.func
def sdf_translate(pos: wp.vec3, offset: wp.vec3):
"""Translates a SDF position vector with an offset."""
return pos - offset
@wp.func
def sdf_rotate(pos: wp.vec3, angles: wp.vec3):
"""Rotates a SDF position vector using Euler angles."""
rot = wp.quat_rpy(
wp.radians(angles[0]),
wp.radians(angles[1]),
wp.radians(angles[2]),
)
return wp.quat_rotate_inv(rot, pos)
@wp.func
def sdf_smooth_min(a: float, b: float, radius: float):
"""Creates a SDF torus primitive."""
# https://iquilezles.org/articles/smin
h = wp.max(radius - wp.abs(a - b), 0.0) / radius
return wp.min(a, b) - h * h * h * radius * (1.0 / 6.0)
@wp.kernel(enable_backward=False)
def generate_volume_kernel(
torus_altitude: float,
torus_major_radius: float,
torus_minor_radius: float,
smooth_min_radius: float,
dim: int,
time: float,
out_data: wp.array3d(dtype=float),
):
"""Kernel to generate a SDF volume based on primitives."""
i, j, k = wp.tid()
# Retrieve the position of the current cell in a normalized [-1, 1] range
# for each dimension.
pos = wp.vec3(
2.0 * ((float(i) + 0.5) / float(dim)) - 1.0,
2.0 * ((float(j) + 0.5) / float(dim)) - 1.0,
2.0 * ((float(k) + 0.5) / float(dim)) - 1.0,
)
box = sdf_create_box(
sdf_translate(pos, wp.vec3(0.0, -0.7, 0.0)),
wp.vec3(0.9, 0.3, 0.9),
)
torus = sdf_create_torus(
sdf_rotate(
sdf_translate(pos, wp.vec3(0.0, torus_altitude, 0.0)),
wp.vec3(wp.sin(time) * 90.0, wp.cos(time) * 45.0, 0.0),
),
torus_major_radius,
torus_minor_radius,
)
out_data[i, j, k] = sdf_smooth_min(box, torus, smooth_min_radius)
# Compute
# ------------------------------------------------------------------------------
def compute(db: OgnSampleProceduralVolumeDatabase) -> None:
"""Evaluates the node."""
# Enforce a minimum dimension or else nothing's left to draw.
dim = max(db.inputs.dim, MIN_RES)
db.outputs.data_size = dim * dim * dim
data = omni.warp.nodes.from_omni_graph(
db.outputs.data,
dtype=float,
shape=(dim, dim, dim),
)
with omni.warp.nodes.NodeTimer("generate_volume", db, active=PROFILING):
wp.launch(
kernel=generate_volume_kernel,
dim=data.shape,
inputs=[
db.inputs.torusAltitude,
db.inputs.torusMajorRadius,
db.inputs.torusMinorRadius,
db.inputs.smoothMinRadius,
dim,
db.inputs.time,
],
outputs=[
data,
],
)
# Node Entry Point
# ------------------------------------------------------------------------------
class OgnSampleProceduralVolume:
"""Node."""
@staticmethod
def compute(db: OgnSampleProceduralVolumeDatabase) -> None:
device = wp.get_device("cuda:0")
try:
with wp.ScopedDevice(device):
compute(db)
except Exception:
db.log_error(traceback.format_exc())
return
# Fire the execution for the downstream nodes.
db.outputs.execOut = og.ExecutionAttributeState.ENABLED
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