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With go.Isosurface, you can plot isosurface contours of a scalar field value, which is defined on x, y and z coordinates.

Basic Isosurface

In this first example, we plot the isocontours of values isomin=2 and isomax=6. In addition, portions of the sides of the coordinate domains for which the value is between isomin and isomax (named the caps) are colored. Please rotate the figure to visualize both the internal surfaces and the caps surfaces on the sides.

using PlotlyJS

trace = isosurface(
    x=[0,0,0,0,1,1,1,1],
    y=[1,0,1,0,1,0,1,0],
    z=[1,1,0,0,1,1,0,0],
    value=[1,2,3,4,5,6,7,8],
    isomin=2,
    isomax=6,
)
plot(trace)

Removing caps when visualizing isosurfaces

For a clearer visualization of internal surfaces, it is possible to remove the caps (color-coded surfaces on the sides of the visualization domain). Caps are visible by default.

using PlotlyJS


data = range(-5, stop=5, length=40)
X, Y, Z = mgrid(data, data, data)

values = X .* X .* 0.5 .+ Y .* Y .+ Z .* Z .* 2

plot(isosurface(
    x=X[:],
    y=Y[:],
    z=Z[:],
    value=values[:],
    isomin=10,
    isomax=40,
    caps=attr(x_show=false, y_show=false)
))