Surface JSON Data

from compas.colors import Color
from compas.geometry import NurbsSurface
from compas.geometry import Point
from compas.geometry import Polyline
from compas_viewer import Viewer

points = [
    [Point(0, 0, 0), Point(1, 0, 0), Point(2, 0, 0), Point(3, 0, 0)],
    [Point(0, 1, 0), Point(1, 1, 2), Point(2, 1, 2), Point(3, 1, 0)],
    [Point(0, 2, 0), Point(1, 2, 2), Point(2, 2, 2), Point(3, 2, 0)],
    [Point(0, 3, 0), Point(1, 3, 0), Point(2, 3, 0), Point(3, 3, 0)],
]

surface = NurbsSurface.from_points(points=points)

# ==============================================================================
# JSON Data
# ==============================================================================

string = surface.to_jsonstring(pretty=True)

print(string)

other = NurbsSurface.from_jsonstring(string)

print(surface == other)

# ==============================================================================
# Visualisation
# ==============================================================================

viewer = Viewer()

viewer.scene.add(other)  # type: ignore

# control polygon of original

points = list(surface.points)
viewer.scene.add([Polyline(row) for row in points], linewidth=1, linecolor=Color(0.3, 0.3, 0.3))
viewer.scene.add([Polyline(col) for col in zip(*points)], linewidth=1, linecolor=Color(0.3, 0.3, 0.3))
viewer.scene.add(points, pointsize=10)

# isocurves of original

u_curves = []
for u in surface.space_u(7):  # type: ignore
    u_curves.append(surface.isocurve_u(u).to_polyline())

v_curves = []
for v in surface.space_v(7):  # type: ignore
    v_curves.append(surface.isocurve_v(v).to_polyline())

viewer.scene.add(u_curves, linecolor=Color(0.8, 0.8, 0.8), linewidth=3)
viewer.scene.add(v_curves, linecolor=Color(0.8, 0.8, 0.8), linewidth=3)

viewer.show()

{
    "is_u_periodic": false,
    "is_v_periodic": false,
    "points": [
        [
            [
                0.0,
                0.0,
                0.0
            ],
            [
                1.0,
                0.0,
                0.0
            ],
            [
                2.0,
                0.0,
                0.0
            ],
            [
                3.0,
                0.0,
                0.0
            ]
        ],
        [
            [
                0.0,
                1.0,
                0.0
            ],
            [
                1.0,
                1.0,
                2.0
            ],
            [
                2.0,
                1.0,
                2.0
            ],
            [
                3.0,
                1.0,
                0.0
            ]
        ],
        [
            [
                0.0,
                2.0,
                0.0
            ],
            [
                1.0,
                2.0,
                2.0
            ],
            [
                2.0,
                2.0,
                2.0
            ],
            [
                3.0,
                2.0,
                0.0
            ]
        ],
        [
            [
                0.0,
                3.0,
                0.0
            ],
            [
                1.0,
                3.0,
                0.0
            ],
            [
                2.0,
                3.0,
                0.0
            ],
            [
                3.0,
                3.0,
                0.0
            ]
        ]
    ],
    "u_degree": 3,
    "u_knots": [
        0.0,
        1.0
    ],
    "u_mults": [
        4,
        4
    ],
    "v_degree": 3,
    "v_knots": [
        0.0,
        1.0
    ],
    "v_mults": [
        4,
        4
    ],
    "weights": [
        [
            1.0,
            1.0,
            1.0,
            1.0
        ],
        [
            1.0,
            1.0,
            1.0,
            1.0
        ],
        [
            1.0,
            1.0,
            1.0,
            1.0
        ],
        [
            1.0,
            1.0,
            1.0,
            1.0
        ]
    ]
}