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## When using transformation matrices, how does one convert orientation and scaling from a global frame of reference into a local one?

Note: I’m certain I cannot be the first to answer this question. Unfortunately, the answers I need are buried under an avalanche of posts asking how to move coordinates between frames of reference, and other similar but unhelpful problems. As part of an ongoing project, I’ve built a Transform object. As one might expect, this […]

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## 3d camera rotation – Raytracing

I’m programming a C raytracer.  I’m having trouble getting the camera to rotate (like the view of an FPS). I’ve tried many methods, but after many tries it’s always flawed. I would like the camera to rotate by pressing keys (F for left, H for right, T for up, G for down, R and Y […]

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## How display in QTableView math texts like Latex [closed]

I’ve an instance: pandas.DataFrame and I wrote in its cells in Latex format, I.g: $\sigma_Y$, $\sigma_{Von Misses}$. Right now, I want to display all this information into QTableView using PyQT5. I findet a solution who takes the matlplotlib library to insert a latex text inside a QtLabel, the problem with it, is that, It doesn’t […]

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## How to display multiple objects in a Cinnamon Applet

I am trying to write a Cinnamon Applet for my panels. I have figured out how to create a simple icon but I cannot figure out how can I get a second one to appear. Here is my current simple code: const Applet = imports.ui.applet; class wholeModule extends Applet.Applet { constructor(orientation, panel_height, instance_id) { let […]

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## PyQT5 and Filtering a Table using multiple columns

I am trying to make a PyQt5 GUI to show a Pandas dataframe in the form of a table and provide column filtering options, similar to the Microsoft Excel filters. So far I managed to adopt a similar SO answer. Here is the picture of my table in the GUI: As shown in the figure […]

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I ran into a problem when trying to pick photo from gallery (app crashes when I pick image uploaded on iCloud). So my first solution was to check if image is on device and if not, then download it from iCloud. I used this code let manager = PHImageManager.default() let requestOptions = PHImageRequestOptions() requestOptions.resizeMode = […]

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## Optimize PyQt5 QAbstractView for Pandas Model

I am currently writing a SQL query interface through Python. When writing the data into a QTableView, I am using a QAbstractTableModel to write the query result. This works fine for smaller queries, but becomes extremely slow when trying to present many rows and columns. Is there anyway to increase the speed that the dataframe […]

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## Remove QComboBox when QCheckBox is toggled off or on using QItemDelegate

I would like to update the cell content of a QTableView with a ComboBox whenever the toggle of a Checkbox above changes. I am using QTableView and a custom delegate to draw the ComboBoxes. The Checkboxes are controlled within the QTableView itself. Currently, when I toggle the checkboxes, the Comboboxes below will appear, but I […]