Solar Rays Tracing path

Hi

I want to generate Solar Ray Tracing path in Ecotect for solar reflectors.
Can some one guide me on this.
I have calculated this in Shading & Shadows analysis to <<Display Solar

. But the reflections are not proper.

How can we generate the full reflections & Bounces.

Regards
Neha

Hi Neha!

I want to generate Solar Ray Tracing path in Ecotect for solar reflectors.

I do not know much details on Ecotect. If you mean any kind of non-planar, specular reflector, than the standard work-flow in Radiance will not lead to good results. I think there are to options if you want to simulate such a system using Radiance - one being the rtcontrib-tool (which I have never used for such tasks), the other the photon map extension, which is made exactly for such cases, but available only for Radiance 3.7 at the moment.

In any way, you would not get a visualization of single rays. I am not sure whether anyone ever developed some script to generate this (whould be possible with rtrace by iterating through intersection points from grid positions/directions). The typical target results for Radiance users would be information on the illuminances reached on a work plane by such a system.

Can some one guide me on this.
I have calculated this in Shading & Shadows analysis to <<Display Solar >>. But the reflections are not proper.

Again, this seams to be some Ecotect-specific stuff. I have no idea what they use for such calculations and whether they have the required forward/bidirectional tracing algorithm implemented.

Another hint, many people out there use ASAP for such tasks as reflector design and analysis.

Cheers, Lars.

Someone did and included it in the distribution. I think it's called
xshowtrace.

Regards,
Thomas

···

On Thu, Nov 5, 2009 at 2:35 AM, Lars O. Grobe <[email protected]> wrote:

In any way, you would not get a visualization of single rays. I am not sure
whether anyone ever developed some script to generate this (whould be
possible with rtrace by iterating through intersection points from grid
positions/directions).

Hi!

Someone did and included it in the distribution. I think it's called
xshowtrace.

Good hint. However, I think that this use case would require to go from the source, not from the view point. I guess that one could get rtrace to get the intersection and direction vectors by taking the light source as first view point. But I am not aware of anyone who did that.

Cheers, Lars.

I'd like to take a step backward here. There's a feature in Ecotect
that lets you cast parallel rays from the sun to surfaces in the
scene. It treats all of these surfaces as perfectly specularly
reflective surfaces, basically mirrors.

Here's a very quick and dirty animation:
http://img695.imageshack.us/i/ecotect.mp4/

If you ever wondered why so many people think light shelves are an
easy way to get light deep into a space, this may be part of the
reason. The way lightshelves affect a space is much more complicated
than that.

--Dave

···

-----Original Message-----
From: [email protected] [mailto:radiance-general-
[email protected]] On Behalf Of Lars O. Grobe
Sent: Thursday, November 05, 2009 9:30 AM
To: Radiance general discussion
Subject: Re: [Radiance-general] Solar Rays Tracing path

Hi!

> Someone did and included it in the distribution. I think it's called
> xshowtrace.

Good hint. However, I think that this use case would require to go from
the source, not from the view point. I guess that one could get rtrace
to get the intersection and direction vectors by taking the light source
as first view point. But I am not aware of anyone who did that.

Cheers, Lars.

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