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HDR Light Studio - Documentation

 

lots of area lights

Area lights are intuitive to use for existing HDR Light Studio users, as minimal new controls have been added to control them.

When a light uses 3D mapping in HDR Light Studio, the Area Light check box is shown. When the check box is enabled, the light is removed from the HDRI map being shared with the Render View and Connection, and an Area Light is created in 3D space in HDR Light Studio with the light content mapped to it's surface. The properties of the light are updated to include area light controls, and exclude non applicable settings such as: Mapping and Blend Modes.

arealight_properties_hdrlightstudio 2016.11

Falloff
Sets how the area light illumination reduces over distance in your 3D scene. The default setting is Quadratic which is physically correct and supported by all renderers. But this can be set to Constant, this means there is no falloff at all.

Cam Visibility
Sets whether the area light can be seen by the camera both in HDR Light Studio and your host/renderer. (primary visibility is another name for this)

Dolly Context
Informs the user how the area light will behave when using the dolly controls. The user can’t change the Dolly Context, this is set depending on which LightPaint mode was last used to position the light (if at all).

Smart Dolly
Moves the light closer or further away, and multiplies the size of the light depending on the context. This is the primary control for setting the distance of the area light.

Dolly Multiplier
A secondary distance control that will move the light closer or further away without altering the size of the light. This is more suitable to be used for fine adjustments of the light distance.

LightPaint Pos
This displays the XYZ coordinates of the clicked LightPaint position for the light. When relevant, these coordinates can be adjusted, again for fine adjustments of the lighting effect. i.e. to nudge the height location of the light upwards without requiring another LightPaint click.

 
It is easier to show you how this all works with these plan view diagrams representing each different Dolly Context and showing the resulting Smart Dolly behavior.

Dolly Context: World Origin
If the light was made via the toolbar, or dragged as a preset onto the canvas or light list, then no LightPaint mode has been used to position the light, so the Dolly Context is set to World Origin. This means the area light will dolly into, and orbit, the World Origin. You can drag the light around on the canvas and it will orbit around your scene. This feels very similar to using lights on the HDRI map, with Smart Dolly controlling the distance of the light from the origin. When using the Smart Dolly slider, the light will scale to maintain its solid angle with respect to the World Origin.

dolly context world origin

Dolly Context: Illumination
When the light has been positioned using the LightPaint mode Illumination, the Dolly Context for that light will be set to Illumination. This means the area light will dolly into the LightPaint position in the direction of the Normal Ray. When using the Smart Dolly slider, the light will scale to maintain its solid angle with respect to the LightPaint position. This will provide a consistent level of illumination on your LightPaint location whatever distance the light is from that location.
 
Changing the Longitude and Latitude of the light, or dragging on the canvas, will orbit the light around the LightPaint position. It would therefore no longer be normal to the LightPaint position if these values are altered.

dolly context illumination

Dolly Context: Reflection
When the light has been positioned using the LightPaint mode Reflection, the Dolly Context for that light will be set to Reflection. This means the area light will dolly into the LightPaint position in the direction of the Reflection Ray, maintaining the position of the reflection. When using the Smart Dolly slider, the light will scale to maintain its solid angle with respect to the LightPaint position.
 
Changing the Longitude and Latitude of the light, or dragging on the canvas, will orbit the light around the LightPaint position. It will also therefore no longer be reflecting in the same location on the model if these values are altered.

dolly context reflection

Dolly Context: Reflection with Maintain Reflection Size On
Works the same a Reflection context, but the light is scaled using Smart Dolly to maintain its size when viewed in a flat surface. For example, a reflection in the screen of a mobile phone. The light can be moved closer or further away without the reflection of the light changing size or position if the Maintain Reflection Size setting is on.

dolly context reflection maintain size

Dolly Context: Rim
When the light has been positioned using the LightPaint mode Rim, the Dolly Context for that light will be Rim. This means the area light will dolly towards the camera. When using the Smart Dolly slider, the light will scale to maintain its size as seen from the camera view.

dolly context rim

 

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