Re: [julia-users] Ray tracing for complex geometry

[kleinsplash]

Thanks a stack. The geometry is defined in a mesh file .obj. Consisting of 
vertices and faces. The objects are complex, so any primitive ray-tracing 
is most likely not going to work. My challenge is that my obj files are 
just not dense enough. If they were I could use the vertices no problem. So 
I either increase the density of the mesh, or ray-trace. 

My outline:

load obj file
set camera angle(random range something like 0-2/pi) 
set focal length(random range)
ray-trace(~1000 points - much greater than the number of vertices I have)
plot the view of the object(just for visual confirmation)
hold 3D matrix of view (x,y,z) or (x,y,ind) 


On Friday, 20 November 2015 18:45:55 UTC+2, Steve Kelly wrote:
>
> How is your geometry defined? If it is an implicit function, ShaderToy.jl 
> (built on GLVisualize) has a raymarching example. 
> https://github.com/SimonDanisch/ShaderToy.jl/blob/master/examples/rayprimitive.frag
>  
>
> The method can be generalized to generating distance fields, but I haven't 
> gotten to it yet. I'd also recommend taking a look at the link in the 
> comments. Inigo has some great stuff on ray tracing techniques for the GPU.
>
> I've been working on a solid modeler that makes describing primitives as 
> functions much easier. 
> https://github.com/FactoryOS/Descartes.jl/tree/master/examples The 
> eventual goal is to get all the geometric realization code on the GPU (SDFs 
> and Dual Contours). 
> On Nov 20, 2015 11:15 AM, "Tom Breloff"  
> wrote:
>
>> Could you describe a little more about your use-case?  I'm not sure that 
>> ray-tracing is necessarily what you want if you're displaying point 
>> clouds.  I would check out GLVisualize.jl as a first step.
>>
>> On Fri, Nov 20, 2015 at 10:18 AM, kleinsplash > > wrote:
>>
>>> I was wondering if someone could help me out with a decision/offer an 
>>> opinion:
>>>
>>> I need a ray tracer that deals with complex geometry (a fast ray tracer 
>>> that can create 1000's of point clouds in minimal time) 
>>> Python has methods: http://pyopengl.sourceforge.net/ that I could get 
>>> to grips with. But I want to stick with Julia. 
>>>
>>> I have found these resources: 
>>> https://github.com/JuliaGL/ModernGL.jl - not sure if this has a ray 
>>> tracing option
>>> http://www.cs.columbia.edu/~keenan/Projects/QuaternionJulia/ - looks 
>>> crazy complicated
>>>
>>> https://github.com/JuliaLang/julia/blob/master/test/perf/kernel/raytracer.jl
>>>  
>>> - looks like only handles simple geometry
>>>
>>> Could someone point me in the right direction?
>>>
>>>  
>>>
>>
>>

Re: [julia-users] Ray tracing for complex geometry

[kleinsplash]

Not sure if you get other comments, please forgive me if this generates two 
mails in your inbox. Please see my answer to Steve Kelly below. 

On Friday, 20 November 2015 18:15:35 UTC+2, Tom Breloff wrote:
>
> Could you describe a little more about your use-case?  I'm not sure that 
> ray-tracing is necessarily what you want if you're displaying point 
> clouds.  I would check out GLVisualize.jl as a first step.
>
> On Fri, Nov 20, 2015 at 10:18 AM, kleinsplash  > wrote:
>
>> I was wondering if someone could help me out with a decision/offer an 
>> opinion:
>>
>> I need a ray tracer that deals with complex geometry (a fast ray tracer 
>> that can create 1000's of point clouds in minimal time) 
>> Python has methods: http://pyopengl.sourceforge.net/ that I could get to 
>> grips with. But I want to stick with Julia. 
>>
>> I have found these resources: 
>> https://github.com/JuliaGL/ModernGL.jl - not sure if this has a ray 
>> tracing option
>> http://www.cs.columbia.edu/~keenan/Projects/QuaternionJulia/ - looks 
>> crazy complicated
>>
>> https://github.com/JuliaLang/julia/blob/master/test/perf/kernel/raytracer.jl 
>> - looks like only handles simple geometry
>>
>> Could someone point me in the right direction?
>>
>>  
>>
>
>

[julia-users] Ray tracing for complex geometry

[kleinsplash]

I was wondering if someone could help me out with a decision/offer an 
opinion:

I need a ray tracer that deals with complex geometry (a fast ray tracer 
that can create 1000's of point clouds in minimal time) 
Python has methods: http://pyopengl.sourceforge.net/ that I could get to 
grips with. But I want to stick with Julia. 

I have found these resources: 
https://github.com/JuliaGL/ModernGL.jl - not sure if this has a ray tracing 
option
http://www.cs.columbia.edu/~keenan/Projects/QuaternionJulia/ - looks crazy 
complicated
https://github.com/JuliaLang/julia/blob/master/test/perf/kernel/raytracer.jl 
- looks like only handles simple geometry

Could someone point me in the right direction?

 

Re: [julia-users] Ray tracing for complex geometry

[Tom Breloff]

Could you describe a little more about your use-case?  I'm not sure that
ray-tracing is necessarily what you want if you're displaying point
clouds.  I would check out GLVisualize.jl as a first step.

On Fri, Nov 20, 2015 at 10:18 AM, kleinsplash 
wrote:

> I was wondering if someone could help me out with a decision/offer an
> opinion:
>
> I need a ray tracer that deals with complex geometry (a fast ray tracer
> that can create 1000's of point clouds in minimal time)
> Python has methods: http://pyopengl.sourceforge.net/ that I could get to
> grips with. But I want to stick with Julia.
>
> I have found these resources:
> https://github.com/JuliaGL/ModernGL.jl - not sure if this has a ray
> tracing option
> http://www.cs.columbia.edu/~keenan/Projects/QuaternionJulia/ - looks
> crazy complicated
>
> https://github.com/JuliaLang/julia/blob/master/test/perf/kernel/raytracer.jl
> - looks like only handles simple geometry
>
> Could someone point me in the right direction?
>
>
>

Re: [julia-users] Ray tracing for complex geometry

[Steve Kelly]

How is your geometry defined? If it is an implicit function, ShaderToy.jl
(built on GLVisualize) has a raymarching example.
https://github.com/SimonDanisch/ShaderToy.jl/blob/master/examples/rayprimitive.frag

The method can be generalized to generating distance fields, but I haven't
gotten to it yet. I'd also recommend taking a look at the link in the
comments. Inigo has some great stuff on ray tracing techniques for the GPU.

I've been working on a solid modeler that makes describing primitives as
functions much easier.
https://github.com/FactoryOS/Descartes.jl/tree/master/examples The eventual
goal is to get all the geometric realization code on the GPU (SDFs and Dual
Contours).
On Nov 20, 2015 11:15 AM, "Tom Breloff"  wrote:

> Could you describe a little more about your use-case?  I'm not sure that
> ray-tracing is necessarily what you want if you're displaying point
> clouds.  I would check out GLVisualize.jl as a first step.
>
> On Fri, Nov 20, 2015 at 10:18 AM, kleinsplash 
> wrote:
>
>> I was wondering if someone could help me out with a decision/offer an
>> opinion:
>>
>> I need a ray tracer that deals with complex geometry (a fast ray tracer
>> that can create 1000's of point clouds in minimal time)
>> Python has methods: http://pyopengl.sourceforge.net/ that I could get to
>> grips with. But I want to stick with Julia.
>>
>> I have found these resources:
>> https://github.com/JuliaGL/ModernGL.jl - not sure if this has a ray
>> tracing option
>> http://www.cs.columbia.edu/~keenan/Projects/QuaternionJulia/ - looks
>> crazy complicated
>>
>> https://github.com/JuliaLang/julia/blob/master/test/perf/kernel/raytracer.jl
>> - looks like only handles simple geometry
>>
>> Could someone point me in the right direction?
>>
>>
>>
>
>