Jumble of Thoughts: here I give myself the liberty to freely write down anything, without caring about correctness, completeness, formatting or relevance. Those draft may be incomplete, incorrect, or just plain wrong. I may convert those notes into a proper article later on, or not.

Summary: Permutation Arrangement Combination

Combinatorics cheat sheet - 05/2023 - #Jumble


C++ code for 2x2 and 3x3 Eigen decomposition

C++ code for 2x2 and 3x3 Eigen decomposition - 05/2023 - #Jumble


MEL how to specify the skin weight value of a joint

In maya, using MEL command how to set the value of a skin weight given a specific joint - 05/2023 - #Jumble


Handling types with Python

Some notes and pointers on using types with Python - 04/2023 - #Jumble


How to clear out (set to 0) the rotation of a joint in Maya

Reset the "rotate" attribute of a Maya joint without changing its "Joint Orient" attribute or its world position - 04/2023 - #Jumble


MEL and Python code to change / reset the bind pose of a skinned mesh in Maya

How to edit the bind pose of a skin cluster in Maya - 04/2023 - #Jumble


MEL and Python code to restore joint positions to their bind pose based on skincluster's .bindPreMatrix

Go to bind pose that works even when bindPose node is corrupted - 04/2023 - #Jumble


MEL and Python procedure to invert a 4x4 matrix in Maya

MEL & Python script code to compute the inverse of a matrix represented as an array of 16 floats - 04/2023 - #Jumble


C code for 4x4 matrix inversion

C C++ code for row major and column major matrix inversion - 02/2013 - #Jumble, Math

Just leaving some code here to invert either column or row major 4x4 matrices.


Upgrade to CUDA 5.0: cudaMemcpyToSymbol invalid device symbol error

- 12/2012 - #Jumble

You have just upgraded to CUDA 5.0 and the function cudaMemcpyToSymbol() throws you the infamous "invalid device symbol" error. Here is what to do.


CUDA constant memory, namespace, and weird bugs

- 09/2012 - #Jumble

Edit: the usage of cudaMemcpyToSymbol describded below is deprecated since CUDA 4.1 (See also my new entry Upgrade to CUDA 5.0: cudaMemcpyToSymbol invalid device symbol error)

Today I want to discuss some issues I had with CUDA constant memory and share some workarounds.


Drag and drop not working in QTDesigner or QTCreator designer

- 06/2012 - #Jumble

This has upset me for some time and I finally found a forum entry solving this problem.

The problem: I wasn't able to drag&drop in QTDesigner any widgets from the widgets list to the form I was editing.
Solution found here: qtforum.org

You only need to add this entry to your /etc/X11/xorg.conf:

Section "Module"
    Load "extmod"
EndSection


Broken F4 shortcut in Qtcreator for cuda files ".cu"

- 06/2012 - #Jumble

Well I'm using QtCreator to code my CUDA project and there has been a lot of things bothering me. Among them is this F4 shortcut which doesn't work. The shortcut enables switching between the header and source file but apparently the extension .cu is not recognized as a C++ source file. Here is how to fix it.