To fit a curve onto a set of points, we can use ordinary least-squares regression. There is a solution page by MathWorks describing the process. As an example, let’s start with some random data: % some 3d points data = mvnrnd([0 0 0], [1 -0.5 0.8; -0.5 1.1 0; 0.8 0 1], 50); As @BasSwinckels … Read more
I needed something similar: drawing the zaxis on both sides. Thanks to the answer by @crayzeewulf I came to following workaround (for left, righ, or both sides): First plot your 3d as you need, then before you call show() wrap the Axes3D with a Wrapper class that simply overrides the draw() method. The Wrapper Class … Read more
Just to elaborate on my comment above, matplotlib’s 3D plotting really isn’t intended for something as complex as isosurfaces. It’s meant to produce nice, publication-quality vector output for really simple 3D plots. It can’t handle complex 3D polygons, so even if implemented marching cubes yourself to create the isosurface, it wouldn’t render it properly. However, … Read more
The code example below provides a way to scale each axis relative to the others. However, to do so you need to modify the Axes3D.get_proj function. Below is an example based on the example provided by matplot lib: http://matplotlib.org/1.4.0/mpl_toolkits/mplot3d/tutorial.html#line-plots (There is a shorter version at the end of this answer) from mpl_toolkits.mplot3d.axes3d import Axes3D from … Read more
3D quiver plots are a brand-new feature in 1.4 it (and it’s documentation) might still be a bit rough around the edges. In this case we can try to use the fact that the quiver is implemented as a LineCollection which (eventually) inherits from ScalarMappable which means it knows what a colormap is and the … Read more
By “camera position,” it sounds like you want to adjust the elevation and the azimuth angle that you use to view the 3D plot. You can set this with ax.view_init. I’ve used the below script to first create the plot, then I determined a good elevation, or elev, from which to view my plot. I … Read more
Add following code before savefig: ax.auto_scale_xyz([0, 500], [0, 500], [0, 0.15]) If you want no square axis: edit the get_proj function inside site-packages\mpl_toolkits\mplot3d\axes3d.py: xmin, xmax = np.divide(self.get_xlim3d(), self.pbaspect[0]) ymin, ymax = np.divide(self.get_ylim3d(), self.pbaspect[1]) zmin, zmax = np.divide(self.get_zlim3d(), self.pbaspect[2]) then add one line to set pbaspect: ax = fig.gca(projection = ‘3d’) ax.pbaspect = [2.0, 0.6, 0.25]
I needed something similar: drawing the zaxis on both sides. Thanks to the answer by @crayzeewulf I came to following workaround (for left, righ, or both sides): First plot your 3d as you need, then before you call show() wrap the Axes3D with a Wrapper class that simply overrides the draw() method. The Wrapper Class … Read more