I searched a bunch of websites to find a working example of how to create a Voronoi based 3D Box.
The following link shows you guys for what i am looking for. Can someone help me out with this?
I created "Seedpoints" in a 3D Box and now what? ... couldn´t find a good and simple example on openprocessing either.
Thank you in advance.
Picture
I think Voro++ is doing exactly what you want. However, it is written in C++ but creating a small wrapper using swig for example will provide you a java binding.
You can start with 2D texture created by processing library Mesh (just use getEdges() function to draw border lines of regions) and use it with texture mapping on your 3D box.
Voronoi diagrams can be easily handled with pixel shaders depending on the format of your seed points This example is the best I've found so far but it relies upon points whose coordinates are computed inside the shader, at least to my understanding.
Related
I have a table with the following structure:
[relation, variable1, variable2]
I would like to visualize those relation over a triangular matrix, something like this but with any number of variables and not only 4. Is there any free java library to do so? any ideas on how to visualize it by my own?
I don't have any code yet, Just thinking about the idea and process of how doing it.
much appreciation to all :)
I suggest you use a Swing framework that is natively provided by Java so you don't have to import any external library for this task.
I think painting this matrix (as in your link) is not difficult using Swing.
I find this discussion very useful for your case How to draw grid using swing class Java and detect mouse position when click and drag
Because it provides an example of painting a matrix.
For a school project i have made a program that can solve a rubiks cube (you know, that cube with all the colors). But now my teachers asked if i could do some research and try out 3d animation for one of the sides. But they want to see the mathematical way to do it. I have found a way to move the corners with the use of polar coordinates. But i do not know how i could render a cube in 3d and be able to animate it.
So my question is: how can i render things like a cube in 3d (or are there any good libraries for it) and how could i use these polar coordinates to animate it?
And is there a good tutorial out there for java 3d rendering?
i must say that i have absolutely no experience with 3d rendering, so it might be a bit difficult. But i really would like to try it out.
thanks in advance
Depending on whether you want to take an existing implementation or if you want to build code for 3D animations from scratch, you might try this tutorial. Graphics programming in this area can be quite involved; a full answer of the question is beyond the scope of this site. However, there are a few main areas.
Usage of vector math for transformation of objects (translation, rotation). This can be done directly or via projective geometry using 4-by-4 matrices. The latter is easier for concatenation of transformations.
Backface culling to remove faces of the object which cannot be seen by the camera.
Using a projection and a camera model to transform 3D coordinates to 2D coordinates.
Using a rasterizer to render the 3D vector information to the screen. Here Bresenham's algorithm might be a good start.
I would suggest you look at one of the 3D libraries. One that I've used a lot and found to be excellent is JMonkeyEngine (JME) which is designed for games but would work well for your needs. It also has an excellent tutorial that takes you from basic to very complex. In fact the first step in the tutorial is a revolving coloured cube!
JME takes a huge amount of the work out of 3D modelling. You build a scene in code with materials, lights etc. and JME does all the work to render it. You can even build your models in a tool such as Blender so you don't even need to do the modelling in code. But I will warn you that using modelling tools is definitely not for the faint hearted.
I'm thinking of making a 3D renderer, I know all about the XYZ dimensions, and am an intermediate Java programmer. But what should I do for a basic renderer? It has to be really basic, what should I render? A cube, a pyramid? A sphere?
Any answer would be much appreciated. Thank you.
My favorite first question for 3D rendering was that how to give feeling of depth with just two, perpendicular and angled from perspective, lines. Solve this and I am sure you will end up building your own 3D renderer.
I realized this is an old question but for anyone wondering I suggest you check out this page which goes through the concepts:
stuff
Then check out this tutorial on creating a 3D rotating cube. It's really easy to convert python code to a language of choice.
stuff
Theres also a javascript version here:
stuff
Then check this out, it explains creating a 3D engine:
http://blogs.msdn.com/b/davrous/archive/2013/06/13/tutorial-series-learning-how-to-write-a-3d-soft-engine-from-scratch-in-c-typescript-or-javascript.aspx
i am writing a 3d modeler similar to Blender for a game i am making. Since programs like blender export very complicated file types with alot of unneeded data i wanted to write a simple editor for my game. what i cannot figure out is how to map a point from a 2d projection on the window to where i have clicked in the 3d world with the world being rotated.
If anyone knows any good tutorials on how to do this or the method any help would be appreciated. I know i could use ray tracing but that would be to complicated i think.
The two main methods of mouse picking are:
Intersection Testing
Color Picking
Intersection tests are the more popular of the two, and at the simplest level involves 'shooting' out a ray and checking if it has intersected any points. The ray can also be replaced by a polytope if one wants to achieve more sensitive picking (useful for choosing points on vertices).
Color picking involves disabling AA, blending, shadows, etc. and re-drawing the scene using solid colors for the objects. glReadPixels is then used to find the color at the point of the mouse and this color is used to determine if it clicked on an applicable object.
Ray Picking:
Mouse Ray Picking Explained
Picking, Alpha Blending, Alpha Testing, Sorting
Color Picking:
OpenGL Selection Using Unique Color IDs
Picking Tutorial
The term you are looking for is mouse picking.
The method you need is gluUnProject. You'll need window x,y and the depth.
I think, in your case, it might be a lot easier to write a simple exporter for Blender.
I'm coding a programm, that will produce 3d coordinates for a rocket and I would like to do a rudimentally graphic output for this.
it just has to be scaleable and rotationable, so that you can change the view manually.
the postions should be connected by lines and
it ould be nice to have spheres for earth and moon ( and perhaps addtional celestial objects).
I think, there should be some ready stuff for this kind of plott already available, but I couldn't find one.
So that's why I'm here to ask you, if you know such a thing.
and if there isn't I would kike to ask you how a bignner like me should start this?
I ust coded for console apllications, because there was no need for a real graphics output.
thank you in advance for any tip! :)
Andreas
I don't think there are sand-box ready things you can use to draw customizable 3d objects in Java, if you can live without strange things you can you just a graph library able to draw 3d graphs like for example jMathTools (link).. otherwise you should go into J3D with opengl and similar things.
I don't think they exist just because doing simple things is trivial if you work with OpenGL or similar APIs..
Doing what you need with OpenGL is not complex at all, just a GL_LINE_STRIP to draw the trajectory and some primitives if you need earth, moon and so on.. rotating and scaling come implicitly moving the camera of your viewport..
Take a look at: Java3D or JOGL
I can't believe nobody has mentioned this yet, but the NASA WorldWind project seems like exactly what you need: http://worldwind.arc.nasa.gov/java/ You can extend it with JOGL if needed, or you can use some of the vast modeling objects already available to mark trajectory and location in 3D coordinates, complete with zooming/rotating and the like. Having accurate Earth layers is nice as well =)
Use JOGL! It is easy to install, and if you know Java it should be easy. There are a few things in JOGL that require you to be decent in trigonometry. This tutorial might help you get started: http://www.youtube.com/watch?v=rT02jFYrXv0