Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
It seems like the modifiers you are saying are invisible correspond to suns that are really low in the sky. At first, I thought it might be some issue with low-angled sources getting rejected, but I poured over the code and couldn't find where that might be happening, so I retested your model without any building geometry. I just put the suns together with your test points in rcontrib and ran it again so that nothing gets in the way of the shadow tests. This time, all the DC columns summed to some non-zero value. TI conclude that some of the suns are not in line-of-sight and are unlikely to be found by the default single-bounce calculation.
Am I missing something? -Greg
| | 2 | No.2 Revision |
It seems like the modifiers you are saying are invisible correspond to suns that are really low in the sky. At first, I thought it might be some issue with low-angled sources getting rejected, but I poured over the code and couldn't find where that might be happening, so I retested your model without any building geometry. I just put the suns together with your test points in rcontrib and ran it again so that nothing gets in the way of the shadow tests. This time, all the DC columns summed to some non-zero value. TI conclude I concluded that some of the suns are not in line-of-sight and are unlikely to be found by the default single-bounce calculation.
Am I missing something? -Greg
| | 3 | No.3 Revision |
It seems like the modifiers you are saying are invisible correspond to suns that are really low in the sky. At first, I thought it might be some issue with low-angled sources getting rejected, but I poured pored over the code and couldn't find where that might be happening, so I retested your model without any building geometry. I just put the suns together with your test points in rcontrib and ran it again so that nothing gets in the way of the shadow tests. This time, all the DC columns summed to some non-zero value. I concluded that some of the suns are not in line-of-sight and are unlikely to be found by the default single-bounce calculation.
Am I missing something? -Greg
