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rainbow in the dark
rainbow in the dark
Comments: 2

14.04.2024, 11:51

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Description: The Groburg, Dakar, knight, shield and sword are from DAZ3D. Lit by my BelowBhutanBridgeSun HDRI, tilted by 90?. The HDRI was subjected to the median-cut algorithm and converted to 256 large lights. When rendered, each of these large lights were assigned 4 lights (quality = 1024) to simmulate light sources with some size. Intensity was set to 35, HDRI-Effect to 15. Rendered Premium with 4 rays per pixel, which took only 60% of the time of a regular render with AA and it finished in around 13 hours.

Knights are also humans and feel an urge now and then.
Added by: Horo
Keywords: DAZ3D, groburg, dakar, knight, shield, sword
Date: 11.16.2007 18:30
Hits: 3959
Downloads: 112
Rating: 4.50 (2 Vote(s))
File size: 282.2 KB
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Author: Comment:

Join Date: 06.04.2006
Comments: 2610

How do you spell relief?

I really like the narrow feeling and the way the eye is draw upward toward the sky.

The sky seems nice but a touch on the dark side.

In the description above you mention some ideas I am not familiar with, such as median cut, and also some sort of light arrangement. It reminded me of the old days of rigging hdri lighting by using gels, or even real lights outside of a transparent sphere colored with an image allowing the light that passes through to be colored by the image. Is this what you mean?

The lighting is working really well for the bricks, I love the way ibl really spells out the bumpmapping. There is a strong and highly saturated dark blue light that I do not understand. It seems a bit unnatural though that does not make it bad. The water in the background responds very interestingly to the light also, almost seems to glow. Knight's pose looks really good and natural as a walking rhythm.
11.17.2007 16:07 Offline rashadcarter1 rashadcarter1 at

Join Date: 05.26.2004
Comments: 4721

Thank you for your comment, Rashad. The base for this render is Thaumaturgiston ( and the camera was set between the buildings about in the centre of the image. The sky was left but the sun removed. The HDRI is the one shown at top right in Illg-Test ( but was tilted. This HDRI features a very strong blue light from above and very strong brown light from below. Tilting it brings the brown up and the blue down. The light this gives is strange, particularly the blue, as you observed.

Bryce cannot use the HDRI as it is to "generate" light, it needs point light sources. An algorithm is used that finds the statistical distribution of lights, intensities and colours and sets point lights, which the raytracer interprets as light sources. I did just that externally and blurred the light sources thus created. There are 256 square light blobs from which Bryce creates the point light sources. Rendering with a quality of 1024 corresponds to 1024 point light sources for the raytracer. I presume that this assigns 4 lights to each of the 256 light blobs and so makes appear the lights having an expanse, which hopefully helps to soften the shadow to light transition.
11.17.2007 18:24 Offline Horo h.-r.h.wernli at

Join Date: 06.04.2006
Comments: 2610

I see. As I follow the links you provided the cause and effect relationship of the image and the lighting become more clear. The blue comes from the sky in the original source photo. The warm colors come from the ground and the green from the vegetation. But I do not feel that I see very much of this particular shade of blue in the source image. Perhaps it is from the deepest part of the sky which is quite blue in nature.
11.17.2007 20:55 Offline rashadcarter1 rashadcarter1 at

Join Date: 01.03.2004
Comments: 2224

The coloured nature of the lighting from the hdr is really one of it's great strengths, not so much, I think because it cannot be done any other way, just that having got loaded the hdr the presence of the coloured light (and critically not being able to subdue those colours - as say a saturation control would allow) forces the artist to explore this effect that perhaps, out of choice, they would have naturally shied away from. Horo has the technical knowledge of the whys and wherefores of the hdr and how the colours and intensities are sampled and how the background (not evident here clearly) is converted so it can be displayed on our ldr monitors. And like Rashad, I've come to recognise that the colours of simulated light do not necessarily seem to match up with the background (source image) as such. I've lost count of the number of hdr's Horo has manufactured on his quest, but it seems there is rarely a good balance to be found between background and lighting. Anyhow to come back to this image, I like the coloured lighting and the overall compositional idea, however I find the busyness of the brick and stone textures a little overpowering and for me undo somewhat the good work of the IBL and tend to disguise the intersting shadow patterns generated by the geometries at play here.
11.18.2007 16:23 Offline davidbrinnen mail at

Join Date: 03.10.2005
Comments: 59

Image has pleasing colors, but I think it has too much light to make "night in medieval town" mood. Reducing intensity or adding fallof/diameter of the IBL should make it darker. I would also add more objects in the foreground: grass, rocks, dirt and the vine from your previous image on the walls.
11.22.2007 11:28 Offline Popgriffon poplowicki at

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