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2023-04-12 12:07:33 -0500 | marked best answer | Hemispherical projection vs equisolid projection I would like to confirm whether the hemispherical projection (
, where I have this question because the following document from Radiance-online.org (https://discourse.radiance-online.org...) claims that the hemispherical projection in Radiance is the same as the equisolid projection. However, the equisolid projection has the following projection equation:
, which is obviously not the same as the first projection. Is this document wrong? |
2023-04-07 15:08:31 -0500 | asked a question | Hemispherical projection vs equisolid projection Hemispherical projection vs equisolid projection I would like to confirm whether the hemispherical projection (-vth) of |
2021-07-02 11:49:58 -0500 | marked best answer | How to generate point-in-time sky-vectors for sun-coefficient step in five-phase method The annual sky-matrix for the sun disk can be generated using (e.g., from here):
However, if I only want to generate the sky-vector for a certain point in time, what should I use? I tried:
but got an error:
Can I simply do
? In this case, will the absence of the sun disk size '-0.533' information post any problem? |
2021-06-30 12:54:49 -0500 | asked a question | How to generate point-in-time sky-vectors for sun-coefficient step in five-phase method How to generate point-in-time sky-vectors for sun-coefficient step in five-phase method The annual sky-matrix for the su |
2021-06-29 14:54:58 -0500 | commented answer | What is the "up" direction defined by -u for the sample hemisphere of the rfluxmtx program I see. The 'up' direction is the zero-azimuth (which is North) direction of the hemisphere, right? In this case, it make |
2021-06-29 14:50:33 -0500 | marked best answer | What is the "up" direction defined by -u for the sample hemisphere of the rfluxmtx program In the tutorial Daylighting Simulations with Radiance using Matrix-based Methods (pp. 42), the "view-up" vector of the rfluxmtx hemispherical sampling is set to +Y direction, as in the figure below. To my understanding, the window of the room model is facing the negative Y direction, which is the "south" direction in Radiance. Then, why is the sampling hemisphere taken to the positive Y direction here? In other words, shouldn't the sampling rays be shot into the negative Y directions to get the daylight matrix? How to understand the definition of the "view-up" vector? . |
2021-06-29 14:50:29 -0500 | commented answer | What is the "up" direction defined by -u for the sample hemisphere of the rfluxmtx program I see. The 'up' direction is the zero-azimuth (which is North) direction of the hemisphere, right? In this case, it make |
2021-06-29 13:52:05 -0500 | commented answer | What is the "up" direction defined by -u for the sample hemisphere of the rfluxmtx program Thank you. Howeve, I am still confused about the -u option. For example, if I have three buildings, one with the windo |
2021-06-29 00:34:36 -0500 | edited question | What is the "up" direction defined by -u for the sample hemisphere of the rfluxmtx program What is the "up" direction defined by -u for the sample hemisphere of the rfluxmtx program In the tutorial Daylighting S |
2021-06-29 00:33:55 -0500 | edited question | What is the "up" direction defined by -u for the sample hemisphere of the rfluxmtx program What is the "up" direction defined by -u for the sample hemisphere of the rfluxmtx program In the tutorial Daylighting S |
2021-06-29 00:32:24 -0500 | edited question | What is the "up" direction defined by -u for the sample hemisphere of the rfluxmtx program What is the "up" direction defined by -u for the sample hemisphere of the rfluxmtx program In the tutorial Daylighting S |
2021-06-29 00:32:24 -0500 | received badge | ● Editor (source) |
2021-06-29 00:29:22 -0500 | asked a question | What is the "up" direction defined by -u for the sample hemisphere of the rfluxmtx program What is the "up" direction defined by -u for the sample hemisphere of the rfluxmtx program In the tutorial Daylighting S |
2021-06-14 20:56:08 -0500 | commented answer | How does the Radiance treat path termination when pathtracing diffuse reflections? Thank you. It now makes sense as -ab is a hard limit on the diffusive bounces. That's probably the reason why setting -a |
2021-06-14 20:51:35 -0500 | commented answer | How does the Radiance treat path termination when pathtracing diffuse reflections? Thank you. It now makes sense as -ab is a hard limit on the diffusive bounces. That's probably the reason why setting -a |
2021-06-14 20:35:37 -0500 | marked best answer | How does the Radiance treat path termination when pathtracing diffuse reflections? In Chap. 12 of Rendering with Radiance by @GregWard and Shakespeare, it is reported that a constant ambient approximation is used when the -ab number of bounces is reached in the pathtracing process. Is this still the way Radiance deals with path termination now? In the source code file ambient.c line 360-380, I do see some code that does constant ambient approximation. However, in the raytrace.c line 119-134, I see that the unbiased Russian Roulette is used. I would like to confirm that for the functions like rcontrib and rfluxmtx, we are actually using Russian Roulette algorithm, right? In this case, the result should be unbiased no matter what -ab, -av or -aw parameter is given, right? In In Chap. 6.4.2 of Rendering with Radiance, the author "expect(s) the prediction for -ab 5 to be greater than those for -ab 1"; this in theory should not be the case for the tracer with Russian Roulette, right? |
2021-06-14 13:34:30 -0500 | asked a question | How does the Radiance treat path termination when pathtracing diffuse reflections? How does the Radiance treat path termination when pathtracing diffuse reflections? In Chap. 12 of Rendering with Radianc |
2021-06-14 13:34:17 -0500 | asked a question | How does the Radiance treat path termination when pathtracing diffuse reflections? How does the Radiance treat path termination when pathtracing diffuse reflections? In Chap. 12 of Rendering with Radianc |
2021-06-14 13:34:04 -0500 | asked a question | How does the Radiance treat path termination when pathtracing diffuse reflections? How does the Radiance treat path termination when pathtracing diffuse reflections? In Chap. 12 of Rendering with Radianc |
2021-06-14 11:10:47 -0500 | marked best answer | Generating view matrices for multiple glazing apertures in Radiance? I want to generate view matrices for each of the 6 separate windows in a room with rfluxmtx. I wonder what is the best practice to do so? Should I put the window I'm interested in in a "GlazingVmtx.rad" file, run someting like
, and include the information of other windows in the octree file? Or, can I put the information of all the windows in one rad file (for example, GlazingVmtx.rad), but only set the window I am interested in as a glow type? Thanks in advance. |
2021-06-14 11:10:47 -0500 | received badge | ● Scholar (source) |
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2021-01-07 12:03:58 -0500 | answered a question | Generating view matrices for multiple glazing apertures in Radiance? I found that Section 7.4 of Daylighting Simulations with Radiance using Matrix-based Methods gave a good example of what |
2021-01-05 09:32:44 -0500 | received badge | ● Student (source) |
2021-01-05 09:32:27 -0500 | asked a question | Generating view matrices for multiple glazing apertures in Radiance? Generating view matrices for multiple glazing apertures in Radiance? I want to generate view matrices for each of the 6 |