V3D | Vector 3D ) is a 3D vector library | Graphics library
kandi X-RAY | V3D Summary
kandi X-RAY | V3D Summary
v3d (Stands for Vector 3D) is a 3D vector library for basic Vector operations. It was inspired by:
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Top functions reviewed by kandi - BETA
- Rotate a Vector .
- Return the angle between two vectors .
- Convert polar to cartesian coordinates .
- Calculate the distance between two points .
- Divide two vectors .
- Multiply the vector by the other .
- Initialize the logger .
- Add another point to this point .
- Scales the current point .
- Converts from cartesian to polar coordinates .
V3D Key Features
V3D Examples and Code Snippets
Community Discussions
Trending Discussions on V3D
QUESTION
One time, my program runs and shows expected output, and sometime it don't (it compiles without any errors). Try-Catch doesen't seem to affect on this random output.
v3f is a simple class that holds 3 floats: x,y,z and some basic math operations on them (all of them work perfectly fine)
ANSWER
Answered 2022-Jan-28 at 21:23Only the mutating operators should return references. The other operators should return values.
OK:
QUESTION
I've installed Debian Bullseye from this page: https://raspi.debian.net/daily-images/
on a Raspberry Pi 4 machine and prepared the required libraries and packages following these guides:
https://github.com/abhiTronix/raspberry-pi-cross-compilers/blob/master/QT_build_instructions.md
This is the compiler I'm using: https://snapshots.linaro.org/gnu-toolchain/12.0-2021.10-1/aarch64-linux-gnu/gcc-linaro-12.0.0-2021.10-x86_64_aarch64-linux-gnu.tar.xz
from this page: https://snapshots.linaro.org/gnu-toolchain/12.0-2021.10-1/aarch64-linux-gnu/
issue description
When I run ./configure... after some processing the compiler throws an error:
aarch64-linux-gnu-g++: error: unrecognized command-line option
-mfloat-abi=softfp
Meanwhile, Linaro or official ARM compilers do not support VFP, FPU, etc. so I had to change the qmake.conf to try to remove that command-line option from the compiler flags.
...ANSWER
Answered 2021-Oct-11 at 03:33fixed this by editing the qmake.conf
used linux_device_post instead of linux_arm_device_post
QUESTION
I'm trying to compile Qt 5.15.2 for arm64 Pi4. The configure phase fails with
...ANSWER
Answered 2021-Oct-01 at 12:18The root cause was that the linker cannot find a dependency of a dependency. LD_LIBRARY_PATH and L doesn't work in such cases. You should use -rpath-link.
You can read more details in the posts I mentioned in the end.
When compiling Qt, you can pass extra arguments for libraries you need. In my case, I had to add the following code to make it work:
QUESTION
I have written a bluez application on Raspbian Buster, Raspberry Pi 4. In some reboots, the bluetooth module and service are not loaded.
On checking the bluetooth.service with command: $ sudo systemctl status bluetooth.service,
I see, Condition check resulted in Bluetooth service being skipped.
I checked $ lsmod and $ dmesg logs for both issue and non-issue conditions.
The difference I find in the lsmod is shown below:
The difference I find in the dmesg log is shown below:
The left side is the issue case and the right side is non issue case.
How can I fix the issue so that the bluetooth works consistently? I am using Raspbian Lite OS 2020-02-14.
Update 1 [03 Feb 2021]: I checked the journalctl log for the issue case and found this:
...ANSWER
Answered 2021-Feb-03 at 09:02My orientation sensor was interfaced to UART2 of Raspberry Pi 4. On getting suggestion from @svin83 , I disabled UART2. After that I rebooted the Pi 4 10 times and the bluetooth worked correctly all the times.
I moved the sensor to I2C-3 bus in Raspberry Pi 4.
As per the documentation, UART Configuration, the UART2 should not have interfered with bluetooth functionality, but it turns out it does.
QUESTION
I have been created a build with Buildroot. Also did it everthing on this comment -> https://www.raspberrypi.org/forums/viewtopic.php?t=263418#p1614833 Did my research, and dozens of trials, and I get nothing.
My config is: Rpi4-64, QT5-Qml, Mesa v3d-vc4, opengl es 2.0
When I try to run my qt qml application on this build, I'm getting this error:
QStandardPaths: wrong permission on runtime directory /usr/bin/, 7755 instead of 7700 drmModeGetResources failed (Operation not supported) no screens available, assuming 24 -bit color Cannot create window: no screens available.
Summary : I need to run my qt5 qml application on Rpi 4 with hw accelerated.
...ANSWER
Answered 2020-Oct-16 at 06:34I found the solution. I think the Rpi4 with eglfs using default card for card0, and this is not work. Need to force using card1 for eglfs.
Create a file "eglfs.json" with the following content:
QUESTION
I have a Raspberry Pi connected to a 480x480 circular touch screen. I have edited the config.txt to reflect the new resolution I want to run. Unfortunately the resolution is only displayed correctly using VNC on the display itself it is weirdly offset and not at all in a 1:1 Aspect ratio.
Touch works like a charm. I already searched Google for how to set the aspect ratio correctly etc. Any ideas what I could try?
config.txt: ...ANSWER
Answered 2020-Jul-02 at 08:28Try:
QUESTION
I have a LiDAR data set that is in 32 bytes binary big endian format and I need to convert it to python list or array then convert it to a PCD file. I'm currently using the following code, but it is only for 16 byte.
What modification should I make to let the code work for 32 byte big endian file? This is a link to the file that I'm working with.
...ANSWER
Answered 2020-Sep-12 at 06:29Based on a downloaded copy of the file that you linked to, it seems that your code is already set up for the correct data length. (For more details about this, see below.) The problem is that you are not telling it to use big-endian. In struct.unpack, > can be used for this - see byte order. size and alignment.
If you change your "ffff" to ">ffff" in your program, then it will work.
Then instead of getting numbers like:
QUESTION
I use qt-everywhere-src-5.15.0.tar.xz and gcc-linaro-7.4.1-2019.02-x86_64_arm- linux-gnueabihf toolchain on an Ubuntu 18 to cross compile Qt and especially QtWebEngine.
I use the following configure:
...ANSWER
Answered 2020-Aug-11 at 21:03If the only libraries that seem to be missing are xtst, xcomposite, xi, etc. Those are located on the Pi in /usr/share. So your sysroot has to sync that folder as well.
QUESTION
I have the following script to calculate fluid perturbations. I am reading in 2D velocity fields and then storing this data in a cell array. In the present example i have only 4 velocity fields from different time steps, but eventually I will have around 300+
The velocity fields are stored in the cell array and that part works. What i need help with is to create a loop to then reshape the matrices in the cell array and store as a separate matrix.
So far i have
...ANSWER
Answered 2020-Jun-03 at 20:45First, some pointers:
cell2mat(U(1,1))is the same asU{1,1}. You should prefer the latter, it's much more efficient because it doesn't do a function call.Naming variables
u1d,u2d,u3d, ... is usually a bad idea. You already figured you could use a cell arrayUto store your vectors, you should store these also in a cell array:ud{1},ud{2},ud{3}, ...
Given these two points, you can do your thing using a loop:
QUESTION
I want to make very simple TV panel tester. With this answer about SDL2 without X I was able to prepare such tester with Raspberry Pi Zero and it works very well. While running I can switch just cable between TVs' and I'm having very fast green screen on tested TV. However when I run program without connected any device on HDMI, I have Segmentation fault.
This is code:
...ANSWER
Answered 2020-Feb-28 at 19:58As @genpfault pointed out in comments, SDL ver. 2.0.10 solved Segmentation fault when no HDMI device is present.
So if somebody is using hg clone ... or git clone ... make sure you switch to correct version of SDL2 sources before build own version.
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Install V3D
You can use V3D like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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