How to use photographic exposure controls in Corona for 3ds Max?
Photographic exposure controls let you adjust scene exposure in a similar way as when using a digital camera - this includes:
To control the exposure with these settings the Photographic Exposure operator must be added to the Tone Mapping.
Note 1: Place exposure control operators, including Photographic exposure, at the top of the Tone Mapping stack, to have full control of the rendered image. Remember that operators are applied from top to bottom.
Note 2: It is recommended to have a single exposure control - Photographic exposure or Simple exposure. In case of having both operators in Tone mapping, e.g. enabling Simple Exposure in the image above, will add up to the exposure generated by Photographic exposure operator (ISO, Shutter speed, F-Stop). This may cause confusion when accurate photographic exposure needs to be achieved.
Where to find Photographic settings?
Global photographic exposure controls in Render Settings:
Photographic parameters in CoronaCamera:
3ds Max PhysicalCamera:
Note: in order to use ISO, you need to add Exposure Control for Physical Camera
How to use them?
Generally, enabling and using the photographic controls is straightforward.
Add Photographic Exposure operator to the Tone Mapping - global or per CoronaCamera override.
- When rendering from a free (non-camera) view:
- Basic Photographic Settings in Render Setup > Camera will always be used
- When rendering from a CoronaCamera:
- Photographic parameters of CoronaCamera will be used - ISO, F-Stop, Shutter speed
Check if CoronaCamera has Tone Mapping override enabled or uses Global Tone mapping, add Photographic Exposure operator accordingly
- Photographic parameters of CoronaCamera will be used - ISO, F-Stop, Shutter speed
- When rendering from a PhysicalCamera
- Aperture, Shutter duration, and ISO of camera will be used
- If CoronaCameraMod is added to the PhysicalCamera, it is the same as rendering from CoronaCamera
Note: when using exposure settings which do not consider photographic parameters, some values can still be used to determine how depth of field and motion blur should look (F-Stop and shutter speed). In such cases depth of field and motion blur appearance is independent from image exposure.