3d rendering objects to an image?

[Tom D]

Hi everyone,

I am trying to find / create a library which can render 3d objects onto an image (ie PNG).

For example:
Obj := engine.NewCube(1,1,1,1,1,1,1)

And engine.Render("lol.PNG")

Would project a cube with the specified coordinates and stuff on the image.

I thought this would be relatively easy to do, so I attempted it myself with some help from Mr Wikipedia. Failed miserably lol.

Has anyone done anything like this or made a library for it?

If yes, Linky :) or can you explain how you did it for someone with limited math knowledge?

Thanks,
Tom

[egon]

It depends on the rendering style.

If you want ray tracing then the code isn't too complicated:

http://www.ffconsultancy.com/languages/ray_tracer/comparison.html

Probably there are Go implementations... first ones http://grammerjack.blogspot.com/2009/11/multi-threaded-go-raytracer.html https://bitbucket.org/zombiezen/goray/wiki/Home

Ray tracing, of course, can take a lot of computational power. 

If you want to go the rasterization route then start something like:

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

or

http://www.amazon.com/Computer-Graphics-Principles-Practice-Edition/dp/0321399528/ref=sr_1_1?ie=UTF8&qid=1398319053&sr=8-1&keywords=Computer+Graphics%3A+Principles+and+Practice

Basically, search either "writing ray tracer tutorial" or "writing 3d rasterizer tutorial". I haven't noticed a a software rasterizer written in Go.

+ egon

[Jsor]

The other way, which is admittedly a bit like using a bazooka to kill a fly, is to grab Open GL (github.com/go-gl/gl) and render to a framebuffer texture, then write that texture to disk. 

[Jsor]

Ah, nevermind, I see that's basically what some of Egon's links were suggesting.

[Stephen Gutekanst]

One possibility would be through OpenGL. In fact you could do it with my game engine by taking a screen-shot [1] but it might be too convoluted for your simple task.

Sadly render-to-texture isn't supported yet so you would have to set the window size to whatever image size you want and take a screenshot using the Downloadable interface on Canvas.

Stephen

[1] https://code.google.com/p/azul3d/source/browse/examples/azul3d_triangle/azul3d_gfx_triangle.go

[Tom D]

Yeah I can't use external libraries, must be pure go. That rasterizer tutorial looks pretty promising, I will have to do a lot of reading though.

I'm surprised no one has made one yet though!

--
You received this message because you are subscribed to a topic in the Google Groups "golang-nuts" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/golang-nuts/SjSFj1atInY/unsubscribe.
To unsubscribe from this group and all its topics, send an email to golang-nuts...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.