In brief
- Geo and Sky defaults to Nanjing, January 1, 16:00; enter project coordinates in decimal degrees and adjust north with North Offset.
- In Advanced Brightness, Sunlight Intensity, Sky Background, and Ambient Light can be adjusted separately; realism comes down to the balance of light.
- When Auto Exposure is on, it compensates for brightness changes; use Manual Exposure while setting up lighting.
- Sun Disk Radius is an artistic setting; overly soft shadows can make a sunny day look cloudy.
This guide is for D5 Render 3.1 (July 2026). The sky and effect parameters described here are in similar locations in D5 2.x. There are three main reasons daylight looks “artificial” in D5: incorrect location and orientation, auto exposure that constantly corrects itself, and sky and sun being tied to the same brightness slider. The steps below address each in turn.
1. First decide: Geo and Sky or HDRI?
Menu path: Environment › Sky
Geo and Sky: Simulates the actual sun angle using the date, time, and coordinates you enter. The sky color changes automatically with the time of day (morning, noon, sunset). Effects such as clouds, the moon, stars, and rainbow flare are available only in this mode. This is the right choice for shadow studies, façade presentations, and telling a client, “This is what the living room looks like at 3:00 PM.”
HDRI: Uses the lighting and reflections from a real photograph. It delivers richer results with glass façades, glossy floors, and water reflections. The key is to use a genuinely high-dynamic-range (.hdr/.exr) spherical (equirectangular) panorama with a 2:1 aspect ratio. A JPG or PNG sky can light the scene, but it won’t produce sunlight shadows.
2. Geo and Sky: Set the location and north correctly
To open the detailed Geo and Sky panel, click the ⋮ button to the right of the North Offset row.
Change the defaults. According to D5 documentation, the default settings represent January 1 at 16:00 in Nanjing (118.8°E, 32°N), where D5 is based. A render of a project in Turkey will have the wrong sun angle with these settings.
Enter latitude and longitude in decimal degrees. Positive longitude is east, and positive latitude is north. Use decimal degrees, not degrees and minutes: 35°30' → 35.5. Examples: Istanbul approximately 41.0 / 29.0, Ankara 39.9 / 32.9, Izmir 38.4 / 27.1.
Correct north with North Offset. D5 treats one of the model’s main axes as north. In scenes imported from SketchUp, the positive direction of the green axis is north. Most models are drawn along the building’s axes, so they deviate from geographic north. A positive value rotates north clockwise when viewed from above.
How to check: The practical test in the documentation is to set the time to 12:00. At a location north of the Tropic of Cancer (23.5°N), shadows point due north. All of Turkey lies in this region.
Set the date and time according to the project’s presentation scenario. The difference between a winter afternoon and a summer noon can completely change where a patch of sunlight falls indoors.
3. Separate sunlight, sky, and ambient light
By default, sunlight and sky brightness are linked. Turn on the advanced brightness option to see three separate parameters:
| Parameter | What it does | How to use it for realism |
|---|---|---|
| Sunlight Intensity | Controls the strength of direct sunlight | Defines sharp sun patches and shadow contrast |
| Sky Background | Controls the brightness and saturation of the sky background | Prevents the sky seen through windows from “blowing out” |
| Ambient Light | Controls the sky’s contribution to scene lighting; it does not change the sky’s blue appearance | Sets how much shadowed areas are filled in; controls the light balance |
The secret to realistic daylight is the balance of light: there should be a noticeable difference between sunlit areas and shadows. If Ambient Light is too high, shadows fill in and the image looks “flat.” If the sun is too strong, blown-out white patches appear indoors.
Sun Disk Radius softens shadow edges to some extent, but D5’s own documentation notes that it is an artistic setting, not physically accurate. It does not change scene brightness. In architectural presentations, overly soft shadows can make a sunny day look cloudy, so keep the value low.
4. If you’re using HDRI
Parameters in the HDRI panel:
Skylight: Adjusts the light and diffuse illumination the HDRI contributes to the scene. It does not affect material reflections.
Background: Adjusts the background brightness and affects material reflections. Adjust this if reflections on a glass façade or water surface look too bright or too dim.
Rotate: Rotates the HDRI horizontally. It changes the background, reflections, and the sun’s azimuth together.
Sky Temperature: Defaults to 6500K. Lower values shift diffuse light toward yellow; higher values shift it toward blue. By default, it affects only the skylight. Use Area of Effect to select Background Only or All.
Custom Sun: Adds sunlight when the HDRI has no distinct sun. Control it with Sunlight Intensity and Sun Disk Radius.
HDRI resolution: Under
Preference › Rendering, you’ll find 2K, 4K, 8K, and Actual Resolution options. The recommended Adaptive setting downsamples the HDRI to 2K in the viewport to save FPS and VRAM, and uses a background of up to 8K in the output. Higher values can quickly consume graphics card memory.
5. Exposure: Use Auto Exposure deliberately
Menu path: Effect › Exposure
D5 documentation includes a critical warning: when Auto Exposure is on, it continually compensates for changes in overall brightness. As a result, changes to HDRI lighting parameters or sunlight intensity may not have the expected effect. This mode, which mimics the human eye’s adaptation, is useful in videos with a moving camera. In still architectural images, however, it can make morning, noon, and evening scenes look “equally bright,” undermining the daylight story.
Recommended workflow:
Turn off Auto Exposure (Manual Exposure) while setting up lighting. This lets you see the actual effect of changes to sunlight and sky.
Adjust exposure so there are no blown-out whites by the windows or “dead black” areas in the corners.
If you have to use Auto Exposure, fine-tune with Exposure Compensation.
Highlight Local Exposure suppresses bright areas and reduces detail loss. Shadow Local Exposure brightens dark areas. Using both moderately in shots looking from indoors toward a window can approximate the effect of exposure bracketing in photography.
The default White Balance is 6500K. Use it to make white look “white” again when warm interior lighting makes grays look yellow. It can also create an artistic color cast. Highlight, Shadow, and Contrast work together to define the tone-mapping curve. To recover detail in a blown-out window, move Highlight to the left.
6. Caustics (optional)
In scenes with a pool, glass table, or water surface, Caustics under Geo and Sky enables sun-generated caustics. For it to work, the caustics option must be enabled on both the light and the material. Only the Custom, Transparent, and Water material templates support caustics.
Before / after: What changes?
Switching from the default Geo and Sky setup (Nanjing, January, 16:00) + Auto Exposure on + linked sunlight/sky settings to the settings above means:
The sun angle and shadow direction match the project’s actual location and date. You can confidently show the shadow study to the client.
The contrast between sunlit and shaded areas is controlled with Ambient Light, so the image no longer looks “flat.”
With Manual Exposure, the scene’s brightness changes as the time of day changes. A morning scene really looks like morning.
The sky seen through the window won’t blow out to white, thanks to Sky Background and Highlight.
Note: The ACEScg working color space introduced in D5 3.1 offers a wider color gamut than linear sRGB, aiming to reduce detail loss under high-dynamic-range lighting and improve compatibility with ACES-based post-production workflows. Colors may change in existing projects, so test it on a copy first.
Sources
4 sourcesSource texts are not republished; short quotes are marked, everything else is our own summary and commentary.
The most common mistake we see in offices using D5 is leaving Geo and Sky at its default location and adjusting only the “time” slider. The image may look good, but when a client says, “This living room doesn’t get afternoon sun,” the shadow study loses all credibility. Entering the correct coordinates, date, and North Offset takes five minutes and addresses one of the most frequently questioned aspects of a presentation.
On the hardware side, D5 is a GPU renderer. The VRAM limit is most often reached with 8K HDRIs and dense vegetation scattering. Leaving HDRI resolution set to Adaptive under Preference › Rendering keeps the HDRI at 2K in the viewport, improving FPS and reducing crashes. On cards with 8–12 GB of VRAM, choose 8K or Actual Resolution only when you need the final output.
Frequently asked questions
How do I set the north direction in D5 Render?
In the Geo and Sky panel, click the ⋮ next to North Offset and change the North Offset value. A positive value rotates north clockwise when viewed from above. In SketchUp scenes, D5 treats the positive direction of the green axis as north.
Should I use HDRI or Geo and Sky in D5?
Use Geo and Sky for shadow studies based on the actual location and date, clouds, and night skies. For rich reflections and a photorealistic sky, use a 2:1 HDRI in .hdr or .exr format. Add Custom Sun if the HDRI has no distinct sun.
Why does my D5 render always come out with the same brightness?
When Auto Exposure is on, D5 continually compensates for changes in overall brightness. That can make changes to sunlight intensity or HDRI lighting seem ineffective. Switch to Manual Exposure in the Effect panel, or fine-tune with Exposure Compensation.
