Is it possible to draw 2D and 3D contour plot like this in python. Sorry I couldn’t provide much detail on the plot in terms of mathematical equations and all. Answer Use plot_surface along with contour to project the contour. It is not limited to the Z plane; you can do this to the X and Y planes as well.

# Tag: 3d

## Rotate Transformation Matrix Around Point

I have a 4×4 transoformation matrix T0 as a starting pose. Now I want to rotate T0 with an 3×3 rotation matrix R around a center point to get a new pose T1. How to calculate T1? Answer The solution is described here. And the working code is below:

## Why is a hg.Vec3() vector passed to a Python function modified by it?

I’m working on a 3D project in Python using the HARFANG 3D wheel (I got from Pypi). I have a function where I pass a series of data, including a vector3: I don’t return position and it is not a global variable. However, when returning from this function, position is modified within the scope of the caller. How to I

## Obtain RGB indexes from colormap based on array value on Python

I have an array storing pressure coefficient values for each triangular face from a 3D geometry, and I am trying to obtain the RGB index values from a jet colormap based on the min and max from this array. I have done this on Matlab like this where cvar is the array storing the values. How can I achieve this

## python 3d list manipulation

I have a 3d list aa = [[[2, 3, 4, 5], [ 6, 7, 8, 9]], [[11, 12, 14, 15]]], which consists of two 2d lists how do I get this result [[2, 6], [11]] the first element of each sub list. gives [2,6,11] Answer You can do it with a list comprehension: Output:

## Ursina – Colorize custom model using MTL file

I’m using python 3.8, Windows 10, Ursina. I have a custom 3D model, created with this tool. When exporting, it includes an MTL file (which I’m guessing it uses to store the shape colors). When I go to load it in Ursina, it gives me the following error: Where <path> is my (correct) folder path. How can I load the

## Pyplot: Plot a 3D figure in a 2D frame?

In my current project, I want to plot a 3D shape with pyplot. This is relatively straightforward: The complication comes from the fact that I would like the figure to display in a straight 2D figure similar to this example: That is to say, remove the 3D axes and ticks, the gridlines, and wrap everything in a flat 2D border.

## How to plot spheres in 3d with plotly (or another library)?

I am struggling with plotting something, that I thought should be really simple. I have a dataframe/table df that contains the coordinates x,y,z of spheres. Additionally, in a separate column, it contains the radius of these spheres. How can I make with plotly a 3d plot of the spheres in space with their correct radius being used? The closest I

## How to plot a line in 3 dimensional space with matplotlib

I have two 3D-points, for example a = (100, 100, 10) and b = (0, 100, 60), and would like to fit a line through those points. I know, the 3D line equation can have different shapes: Vector-form: Parameter-form: But I have a problem getting the data in the right shape for a numerical function. Answer The following code should

## Use slider to choose which graph to show

Suppose I want to show three simulations by reading three .xlsx files. Next, I want to design a slider to choose which simulation to show. If I move the slider to 0, then 0 will be the input to the function “update()”. The first simulation will be shown. The following is the code: If I move the slider, “ddd” gives