渲染

几何渲染

展示一些使用 dash_vtk 渲染网格的例子。

# from dash import jupyter_dash

# jupyter_dash.infer_jupyter_proxy_config()
from dash import Dash, html

import dash_vtk
from dash_vtk.utils import to_mesh_state

try:
    # VTK 9+
    from vtkmodules.vtkImagingCore import vtkRTAnalyticSource
except ImportError:
    # VTK =< 8
    from vtk.vtkImagingCore import vtkRTAnalyticSource

# 使用 VTK 获取一些数据
data_source = vtkRTAnalyticSource()
data_source.Update()  # <= 执行源文件以生成输出
dataset = data_source.GetOutput()
# 使用 helper 获取可以直接传递给 Mesh 的网格结构，RTData 是字段的名称
mesh_state = to_mesh_state(dataset)

content = dash_vtk.View([
    dash_vtk.GeometryRepresentation([
        dash_vtk.Mesh(state=mesh_state)
    ]),
])

# Dash setup
app = Dash(__name__)
server = app.server

app.layout = html.Div(
    style={"width": "100%", "height": "400px"},
    children=[content],
)

if __name__ == "__main__":
    app.run(host="localhost",
            # jupyter_server_url="<your-url>"
            port="8060", 
            jupyter_height=400, 
            jupyter_width="70%")

# Use helper to get a mesh structure that can be passed as-is to a Mesh
from dash_vtk.utils import to_mesh_state
mesh_state = to_mesh_state(dataset)

content = dash_vtk.View([
    dash_vtk.GeometryRepresentation([
        dash_vtk.Mesh(state=mesh_state)
    ]),
])

# Dash setup
app = Dash(__name__)
server = app.server

app.layout = html.Div(
    style={"width": "100%", "height": "calc(100vh - 15px)"},
    children=[content],
)

if __name__ == "__main__":
    app.run(debug=True)

体积渲染

上一个例子是使用 3D 图像并提取其网格进行渲染。让我们保持相同的数据，但以体积渲染的方式展示它。

from dash import Dash, html

import dash_vtk
from dash_vtk.utils import to_volume_state

try:
    # VTK 9+
    from vtkmodules.vtkImagingCore import vtkRTAnalyticSource
except ImportError:
    # VTK =< 8
    from vtk.vtkImagingCore import vtkRTAnalyticSource

# Use VTK to get some data
data_source = vtkRTAnalyticSource()
data_source.Update()  # <= Execute source to produce an output
dataset = data_source.GetOutput()

# Use helper to get a volume structure that can be passed as-is to a Volume
volume_state = to_volume_state(dataset)  # No need to select field

content = dash_vtk.View([
    dash_vtk.VolumeRepresentation([
        # GUI to control Volume Rendering
        # + Setup good default at startup
        dash_vtk.VolumeController(),
        # Actual volume
        dash_vtk.Volume(state=volume_state),
    ]),
])

# Dash setup
app = Dash(__name__)
server = app.server

app.layout = html.Div(
    style={"width": "100%", "height": "400px"},
    children=[content],
)

if __name__ == "__main__":
    app.run(debug=True)