Is there any way to clear a surface from anything that has been blitted to it?

I have a bunch of coplanar points defining a polygon in 3D space. These are always wound the same way (e.g. clockwise). I need to determine the signed normal to the plane containing this polygon, i...

I have in mind this video, or this simulation, and I would like to reproduce the geodesic lines on some sort of surface in 3D, given by a function f(x,y), from some starting point. The midpoint me...

Dear fellow stackoverflow users, I face a problem as follows: I would like to fit a 3D ellipsoid to 3D data points within my python script. The starting data are a set of x, y and z coordinates (ca...

I am currently working with astronomical data among which I have comet images. I would like to remove the background sky gradient in these images due to the time of capture (twilight). The first pr...

Im running win7 with python 3.3 and PySDL2 0.5. When creating surfaces (no matter what method) i get an LP_SDL_Surface instead of a SDL_Surface. The LP_SDL_Surface lacks any of the methods and attr...

Using a 2d matrix in R, how can I create a 3d surface plot, where columns=x, rows=y and the values are the heights in z? In the example below, x values would be 1:5, y value would be 1:5, and the ...

I am trying to plot a surface using matplotlib using the code below: from matplotlib import cm import matplotlib.pyplot as plt import numpy as np from mpl_toolkits.mplot3d import axes3d, Axes3D im...

Given a simple monochrome bitmap that contains a single, randomly rotated rectangle. How can I find the left/top, left/bottom, right/bottom and right/top corner positions of the rectangle inside th...

In a surface shader, given the world's up axis (and the others too), a world space position and a normal in world space, how can we rotate the worldspace position into the space of the normal? Tha...

I want to display an image with alpha with a specified transparency, but can't figure out how to do it. To elaborate on how I'm struggling with this, the blurb below is a slightly modified hunk of...

I have a lot (289) of 3d points with xyz coordinates which looks like: With plotting simply 3d space with points is OK, but I have trouble with surface There are some points: for i in range(30)...

I am trying to find the parametric equation of the trajectory of a point jumping over different spots on the surface of a unit sphere such that: each jump is small (pi/4 < d < pi/2) and in ...

I've quite the same problem than this OpenGl goes too dark but the answer doesn't work for me. I'm trying to display a image thanks to a surface converted to a texture and the result is too damn da...

I have som PNG image links that I want to download, "convert to thumbnails" and save to PDF using Python and Cairo. Now, I have a working code, but I don't know how to control image size on paper....

How do I animate a surface if it's coordinates change in time (e.g. ellipsoid) using MATLAB?

I am trying to model an asteroid using plot_surface and plot_wireframe. I have x y and z values for the points on the surface of the asteroid. The wireframe is accurate to the shape of the asteroid...

I would like to create a plot of the 3D surface that spans over all points from an [X,Y,Z] point cloud. For example this is a scatter plot of my point cloud: scatter3(X,Y,Z,5,C) As you can see ...

I am trying to plot some HDF data in matplotlib. After importing them using h5py, the data is stored in a form of array, like this: array([[151, 176, 178], [121, 137, 130], [120, 125, 126]) In...

I have a surface plot I'm trying to do. x is an 11 element vector, y a 300 element vector and z a 300*11 element matrix. When I try to plot it like this: surf(x y z) The surface plot doesn't sh...

What is the best way in OpenCV to apply correction on an image projected to a 3D surface like in my examples or shown in Projection on 3D surface? My first tests with OpenCV checkerboard corner de...

I have points in 3D space and their corresponding 2D image points. How can I make a mesh out of the 3D points, then texture the triangle faces formed by the mesh?

I need to figure out how to get the data from D3D textures and surfaces back to system memory. What's the fastest way to do such things and how? Also if I only need one subrect, how can one read ...