vecmath | SIMD HAL header-only library

by GaijinEntertainment C Version: Current License: BSD-3-Clause

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | vecmath Summary

vecmath is a C library typically used in Big Data applications. vecmath has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

SIMD HAL header-only library. This is one-header-only (it is 4 headers, but you need to include one) Hardware Abstraction Layer over SIMD intrinsics. Currently for SSE and NEON only, PS3/Xbox360 version is under NDA and not needed nowdays. It has been tested on PC, Linux, MacOS, iOS, tvOS, Shield, NSwitch, PlayStation4, Xbox One. And with gcc of several versions, VS 2015, VS 2017, clang 3.9+. Visual Studio of earlier versions used to work, but hasn't been tested in a while. Current version relies on alignas c++11 modifier, although it is easy to re-write it old-way (attribute / __declspec(aligned)) if needed. It works with SSE2 set only, although there are some optimizations for SSSE3/SSE4.1, if they are mandatory (by architecture).

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Support

vecmath has a low active ecosystem.

It has 26 star(s) with 9 fork(s). There are 5 watchers for this library.

It had no major release in the last 6 months.

vecmath has no issues reported. There are 1 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of vecmath is current.

Quality

vecmath has no bugs reported.

Security

vecmath has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

vecmath is licensed under the BSD-3-Clause License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

vecmath releases are not available. You will need to build from source code and install.

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vecmath Key Features

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vecmath Examples and Code Snippets

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Community Discussions

Trending Discussions on vecmath

How to use face normal for back-face culling in perspective projection scenes

“Group” vecmath Point objects based on the distance between them

Maven Bnd Repository Plugin fails to fetch artifact from remote artifactory

c# - How to execute a .Jar file with Arguments.Length > 8191

Error: Could not find or load main class net.minecraft.launchwrapper.Launch when launching Minecraft 1.12.2 with Forge

Creating a fold that allows the type to change after each repeated function call, in order to call a function n times without recursion

How to setup LWJGL with Maven?

MInecraft java run arguments ignore assets

Can one declare a constructor using a typeded or typename as in Microsoft C in other compilers?

Why do get this error when trying to lauch MC Failed to download file. minecraftforge-9.11.1.1345.jar?

QUESTION

How to use face normal for back-face culling in perspective projection scenes

Asked 2021-Apr-20 at 14:22

I am writing low level 2D/3D rendering engine as a part of display driver for MCU platform in C++ and I hit a wall with perspective projection in 3D and face culling.

Lets assume my 3D engine is using M,V,P matrices (in the same manner as Model,View and Projection matrices in OpenGL fixed pipeline).

The idea is to convert rasterized face normal into view local coordinates (using MV) and test the sign of coordinate corresponding to view direction. The same can be done with dot product between camera view direction and the normal itself. And according to sign either rasterize or skip face. This works well for parallel rays projections ... however with perspective projections this leads to false positives (you can see faces "visually" tilted away up to some angle).

For filled surfaces this poses only performance hit as depth buffer remedies the artifacts so render looks like it should. However wire frame is a problem:

The remedy is to transform vertexes of face by MVP and do the perspective divide. And then re-compute the normal from the result and use that for face culling:

However that is a lot of more operations which on slow platforms like MCU could pose a performance problem. So my question is:

If it is possible How to use face normal for back face culling safely?

I have tried to transform the normal locally by transforming face center and its small displacement in normal direction by MVP with perspective divide and then recomputing the normal from these 2 points. Still twice the operations then using directly normal but better than 3x. However result was not correct (looked almost identical to using normal directly).

I am thinking of somehow computing the tilt angle for given projection / location and test the:

...

ANSWER

Answered 2021-Apr-20 at 14:22

Usually, face normal is not used for backface culling. Instead of it, rasterizers use screen positions of triangle vertices. Basically, if vertices are in clockwise order on screen this face is considered to be facing away.

Moreover, it is possible to have a triangle with normal pointed away from view direction and yet faced to the camera.

Source https://stackoverflow.com/questions/67175750

QUESTION

“Group” vecmath Point objects based on the distance between them

Asked 2020-May-19 at 11:00

I have a load of vecmath Point objects (Point3d FWIM) which I would like to “group” based on the distance between them. I can probably write the code for this from scratch (I’ve done similar tasks in excel), but I like the idea of using existing libraries where possible. The problem is I can’t find any libraries like this.

I haven’t thought through the exact algorithm fully, but I hope I’ve done enough for the question not to be deleted. Please bear with me, I'm still new here at the time of this post.

I imagine the grouping would work as follows:

decide the distanceLimit
loop 1: for each Point, calculate the distance to each other Point
Make a "Set"
loop 2: for each Point
- if the next Point is within the distanceLimit of any previously considered Points up to i, add it to current "Set"
- Else make a new "Set".

Edit: ah the power of verbalising one's ideas. The above doesn't the capture the situation where points 1 and 2 are between one and two distanceLimits apart and initiate separate "sets", and point 3 crops up halfway between them meaning that all three should be in one set really. Need to think about this some more!

I’m also not sure yet what data structures I should really use for the input and output (ArrayLists? Sets?). Ideally I am looking for an existing library that does this or similar; if you’re confident there isn’t one, then any suggestions for the algorithm or the actual code would be more than welcome.

...

ANSWER

Answered 2020-May-19 at 10:59

After lots more googling, I found that:

what I was trying to do is called clustering;
this did exactly what I was trying to do; I was impressed with how well it worked for me.

Source https://stackoverflow.com/questions/59217664

QUESTION

Maven Bnd Repository Plugin fails to fetch artifact from remote artifactory

Asked 2020-May-01 at 01:45

I'm trying to get bnd tools structure working (started with tutorial https://bndtools.org/tutorial.html)

Added use of javax.vecmath (as simple library as I could think of) in cnf/central.maven file

...

ANSWER

Answered 2020-May-01 at 01:45

Ended up solving the issue with help from https://groups.google.com/forum/#!forum/bndtools-users having found two (three?) problems with my configuration.

The correct form for repository definition in build.bnd seems to be

Source https://stackoverflow.com/questions/61514836

QUESTION

c# - How to execute a .Jar file with Arguments.Length > 8191

Asked 2019-Dec-21 at 19:39

I should starting a .jar several times like this

...

ANSWER

Answered 2018-Mar-11 at 12:08

You could make your program receive a file as an argument and read it. The file would have one or more lines depending the number of arguments you'd like to pass to the program.

Your program would need to receive the file and parse it line by line.

Source https://stackoverflow.com/questions/49210775

QUESTION

Error: Could not find or load main class net.minecraft.launchwrapper.Launch when launching Minecraft 1.12.2 with Forge

Asked 2019-Jun-11 at 05:59

I've written a launcher for Minecraft 1.12.2 in Python, which just prepares a command and runs it using subprocess.

This is the command formed on Linux Ubuntu:

...

ANSWER

Answered 2018-Sep-22 at 00:02

Ok, actually, on Windows the classpath separator is ; not : Replacing separator fixes this issue

Source https://stackoverflow.com/questions/52304492

QUESTION

Creating a fold that allows the type to change after each repeated function call, in order to call a function n times without recursion

Asked 2019-Feb-21 at 16:00

I am trying to use a dfold defined here

...

ANSWER

Answered 2017-Mar-13 at 08:52

Your base case was wrong; it should be

Source https://stackoverflow.com/questions/42191163

QUESTION

How to setup LWJGL with Maven?

Asked 2019-Feb-15 at 11:25

Im unable to successfully add proper dependencies for LWJGL in maven project. I have copied lwjgl dependency tempalte from maven repository, added it to my pom.xml and tried to run basic application from lwjgl.org, without success.

Below you have my pom.xml file, unfortunately when I try to run my first application i get:

Exception in thread "main" java.lang.UnsatisfiedLinkError: Failed to locate library: lwjgl.dll

I found some sollution that I need to download all jars and attach them as jar library, so I did. File > Project Structure > Librarires > added folder which store all jars for LWJGL, unfortunately this is still not working.

...

ANSWER

Answered 2019-Feb-15 at 11:25

Please go to https://lwjgl.org/customize, select a variant (Release, Stable or Nightly), select "Mode" = "Maven", select all your needed/wanted modules and simply copy/paste the produced pom.xml snippet.

Source https://stackoverflow.com/questions/54701950

QUESTION

MInecraft java run arguments ignore assets

Asked 2019-Jan-26 at 14:46

because I have modified the Minecraft server, I decided to write my own startup program, everything works well outside Minecraft, it means that Minecraft itself turns on, but the game does not load and says gamelog ignores the argument --assetsIndex

...

ANSWER

Answered 2019-Jan-26 at 14:46

So the problem here is you got 2 typos. Change verison 1.12.2 to version 1.12.2 and assetsIndex 1.12 to assetIndex 1.12

So the final result will be:

Source https://stackoverflow.com/questions/54378336

QUESTION

Can one declare a constructor using a typeded or typename as in Microsoft C in other compilers?

Asked 2018-Dec-09 at 08:12

Well annoyingly it seems to work in Microsoft C but not other compilers I use.

Especially desirable when using templates. Maybe I don't know the "standards compliant way" to do this, but It is really useful and i want code to compile on gcc, clang, etc.

...

ANSWER

Answered 2018-Dec-09 at 07:39

The template name serves as an injected class name inside the scope of the class template itself. This is standard and valid:

Source https://stackoverflow.com/questions/53690328

QUESTION

Why do get this error when trying to lauch MC Failed to download file. minecraftforge-9.11.1.1345.jar?

Asked 2018-Nov-16 at 22:45

I am currently working for the Crafting Dead as a developer and I need to make an installer for our mod. The installer had to download the latest cd mod from our download server, put the .jar in the mod folder and install forge 1.6.4 + add it in the launcher_profiles.json. I have made the installer in java and it works. When I try to start mc with forge 1.6.4 on windows, it works but it doesn't work on mac. I get this error:

...

ANSWER

Answered 2018-Nov-14 at 18:41

Your error Error details: HTTP 404: Not Found indicates that you are requesting a resource not present on the server. This probably means the URL is wrong, this might also happen if file has been moved, or the file does no longer exist on the server.

Also the day before you asked this question there were reports on the minecraftforge server having problems which might not have been resolved till your request. You might also want to change the URL's to use https instead of http, as, from what I can tell, it is planed to switch the servers to https only so your request will then fail again.

Source https://stackoverflow.com/questions/53145524

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Install vecmath

You can download it from GitHub.

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