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Morphious

Sunlight Overhead Or Top Lighted Only Image?

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Hello, can anyone help with suggestions how I can set sunlight to be directly overhead and centered in the image?  Or the best way to ray trace with a light source directly from above with no shadows? 

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I'm attempting to make a very clean looking top down view of the first floor, minus the roof and it has a white background. 

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I'm attempting to make a very clean looking top down view of the first floor, minus the roof and it has a white background. 

 

Orthographic or Perspective view?

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You might find that you need to add some light sources of your own too (3D>Lighting>Add Lights) and just toggle Casts Shadows off. 

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Thats where I currently am, but there is nothing called Tilt Angle... 

Double click it, or select it and click Adjust

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Im currently in the Sun Angle Specifications, nothing called Tilt Angle in here. on any of the selection boxes of sections in this adjustment screen.  Will give adding a light source a try, Thank you for your help! 

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I ususally place a 3D point light in the center of the room and center height, shadows off and sun off. If you are running with photon mapping you need at least one light sources.

 

Graham

post-4793-0-69265800-1456430091_thumb.jpg

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If you want to use a sun, from the Sun Angle Specification dbx, change Lat and Long to zero, Sept, 22, 2015, 12pm, GMT 00:00.

That should get you fairly close to overhead.

 

Or, better yet, upgrade to X8.

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I see whats going on. You added the sun angle to your plan (which apparently gives you a different dbx when you try to edit your default sun) . I would just temporarily delete that and then try my instructions again. What Glenn suggested should do about the same thing, I just think the other way is easier.

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OK , deleted the old sun angle, and with help from everyone on here I did get the sun overhead  in the Perspective Floor overview with shadowing turned on.   The issue arises when I run the Ray Trace. No matter what settings I have tried I cannot get the background white. It keeps coming out as grey and the overall image is dark, even though in the ray trace options I have changed just about everything even increased all of the intensities to 3+ to see it that would lighten it up, but it would not. I've changed around properties after the setting and I can get the image to lighten up by changing contract etc, but it starts to change the colors and loose contrast in the image.

Ive attached 2 images, the perspective view coloring and brightness is what I'm trying to achieve but end up each time with a very greyed out image you can see in the second image. 

Sorry for being such a NooB

post-4968-0-79344900-1456501536_thumb.jpg

post-4968-0-99100200-1456501536_thumb.jpg

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Looks like one of two things. Is the sun light colour set to "Grey", if so set it to white. Looks like the backdrop in 3D is set to "remove backdrop", just make sure that is the case.

 

Graham

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Also, looks like some of your other settings are not ideal. Here's one I just ran on a preliminary being worked on. 30 passes 1 min 30 sec.

 

Graham

post-4793-0-00044200-1456504210_thumb.jpg

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OK I figured it out.   Graham you where right, it was other settings. I started with a new plan and rendered it and compared the settings. For anyone else with this issue in the future. In ray trace, select Edit then go to Lighting and disable the "Enable Environment Light (Outside)".  

Thank you for your help!  

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Glad you were able to find a setting that works for you.

 

It can be a challenge to get a handle on all of the items that have an impact on lighting a scene, especially when you have multiple light sources & types, 3D lights, sunlight and interior/exterior ambient controls to name a few. The effect/result is also impacted on whether or not you use "Use Camera View Settings" in the Raytrace DBX, "Photon Mapping" and "Tone Mapping". Not only is the quality of the scene affected by these but also the time/number of passes needed to generate the scene.

 

 

Graham

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