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Forums >> Revit Building >> Technical Support >> Light Leaks in Perspective
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I've got a leak. See attached image. The lights on the right are identical to the ones on the left, using manufacturer ies data and bulb intensities, so why are the ones on the right so leaky while the ones on the left look fine?
Don't know if anyone has experienced this before... just curious. I'll be fixing it in Photoshop, either way.
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Sorry. Revit Architecture 2012 using Mental Ray engine "printer 150dpi" Interior-Artifical only.
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Where - what is your light source? You should be using lines here.
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Light source is a parametric web file located just under the bulb's physical location (not below the ceiling) inside the fixture of the ceiling recessed linear downlight.
Source seems irrelevant to me as the light on the right is shining on the ceiling and the light on the left is not, while both are identical family, type, and source.
I'm curious if the perspective you have on a light can affect the light's appearance with respect to how it is shining on nearby objects (incidentally, none of the surrounding geometry is reflective enough to show that kind of hot spot at the light source.)
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Hard to know exactly what's going on, but a couple of things to check: Try adjusting the level of the light source within the fixture- moving it up higher into the fixture may help. If it's too low, you may be getting "spill" light on the ceiling. Are the dimensions of your light source the same as the opening of the light fixture? (you want a rectangular light source, not a line for these fixtures.) is it centered in the opening? Is the louver material something highly reflective? Maybe try changing it to something matte. The viewing angle from the camera to the individual fixtures may be a contributing factor, as those that are farther away are being seen at a shallower angle. I suspect you'd see the same thing with all the fixtures if the rendering were done from a different camera view. Hope some of this helps. If you want to post the family I'll try to take a look at it.
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From your HELP:
The size of the symbol that represents the light source in 2D and 3D views, extending from the boundary of the Emit from Shape outwards. For example, suppose you define a light source with an Emit from Shape of circle and an Emit from Circle Diameter of 500 mm. If you specify a Light Source Symbol Size of 200 mm, in a 2D view, Revit Architecture shows a light source symbol that is 900 mm in diameter (200+500+200). This parameter is available when the Emit from Shape setting is Circle or Rectangle. (See Defining the Geometry of a Light Source.) This parameter does not affect the light in a rendered image.
Your shape appears to extend below the ceiling.
Emit from line does not work the same: The length of the line that represents the light source in a rendered image. This parameter is available when the Emit from Shape setting is Line. (See Defining the Geometry of a Light Source.)
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Switched to a rectangular "emit from" to no effect. I had already checked into the light source location with respect to the ceiling and it was also fine (not below the fixture, but inside it). The material of the louvered fins is just a white metallic paint, with no reflectivity... I changed it to a flat paint with no effect.
Interstingly, the Bucket render does not pick up on the "shine" until the final post-processing. See the Capture2,3 images attached.
I also included the section from the project through the fixture showing the placement of the light source (Capture4) and attached the family which has been modified several times. The type that I've been messing with is "4'-1Lamp-28W-T5-120V."
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FYI, in reply to WWhub the original light source definition (and that of the screen captures) is "emit from line." I also rotated the light source multiple times in the family in trial and error to see if the light source was inadvertently emitting from a vertical line (it was not). The rectangular shape has no effect in this instance.
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One thing about this family is that the photometric web file does not seem to go with this fixture. It looks like a generic web. The yellow lines show the shape of the photometric web, and what is showing is a generic omnidirectional distribution, as if from a bare A lamp. Do you have the manufacturer's ies file saved on your hard drive? if not, you need it, or you'll need to use something from the standard ies files that come with Revit. I substituted 461T5_A.ies from the Revit ies folder (see attached). I think you'll see a difference in the rendering.
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Change your light distribution.
< Should be the right one
Edited on: Mon, Mar 5, 2012 at 4:06:00 PM
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As a 'tip and trick' I always create a little 10'x10' room with a scope box for testing my light fixtures prior to going full-scale. This fixture works fine in the test room now and before all the modifications from this thread; Capture5 attached. Note only minor ghosting of the fixture on the ceiling.
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103785_RecessedCooperNeoRayRecessed_Symbio194.rfa
