Global Render Values Rollout

 Available in Krakatoa v1.5.0 and higher

The Global Render Values rollout provides Overrides for various render values including Background Color, Particle Scatter Color, Emission, Absorption and Density Channels and any other channels that can be modified using MagmaFlow.

Background Color Override Group Of Controls

The Background color override used to be located in the Main Controls rollout in versions prior to 1.5.0.
- Since it affects the whole scene but is also used rarely, it was moved into the Global Render Values area.
- When checked, the >Override Background Color option will cause the Color AND ALPHA specified by the color spinner to be used as the background color and alpha of the rendered image.
- When unchecked, the 3ds Max Environment Background color (but NOT environment map!) will be used instead. In that case, the Alpha will be zero.

The History icon next to the color picker in v1.5.1 and higher can be used to browse all colors ever used as Background Color override according to the Render History caches.
- You can click any of the small color samples representing unique colors used for the given color - the clicked color will be set as the new Background color.
- The large color sample above the smaller ones represents the active color at the moment the History was opened. It can be used to revert back to it instead of accepting the new color.
- The drop-down list on top of the dialog will display the names of all history records (including Scene name, date and time) that use the color that was clicked. This is for reference only, selecting a record from the list does not change anything.

Global Shading Channel Overrides Group Of Controls

The Global Shading Channel Overrides allow the fast and easy overriding of the main shading channels with user values without the explicit use of Krakatoa Channel Modifiers.
- The >Override Color option will replace the Scatter Color of all loaded particles with Color specified by the color picker and/or the map.
  - When no map is provided, the particles will use the Color Picker only.
  - When a map is provided and the Map Amount spinner is 100.0, only the Map color will be used.
  - When a map is provided and the Map Amount spinner is less than 100.0, a blend of the Color Picker and the map color will be used.
- The >Override Emission option will replace the Emission Color of all loaded particles with the color specified by the Color Picker and/or the Map. The >Use Emission checkbutton must be checked in the Main Controls for the Emission Channel to be available. The Color Picker, Map and Map Amount are used like described above for the Color Override.
- The >Override Absorption option will replace the Absorption Color of all loaded particles with the color specified by the Color Picker and/or the Map. The >Use Absorption checkbutton must be checked in the Main Controls for the Absorption Channel to be available. The Color Picker, Map and Map Amount are used like described above for the Color Override.
- The >Override Density option will replace the Density value of all loaded particles with the color specified by the Map.
In Krakatoa v1.5.1 and higher, all four context menus provide a Color History option which invokes the same dialog as described above for the Background Color override History.

Global Channel Override Sets Group Of Controls

The Global Channel Override Sets controls provide means for scene-wide Channel manipulation using Krakatoa Channel Modifiers (KCM) applied to particles of any source (including Particle Flow, TP, Geometry Vertices, GeoVolumes and PRT Loaders) in world space after they have been loaded.
- Global Modifiers can change any existing channels including Color, Position, Velocity, Normal etc. and also create new Channels that might not be available in the incoming stream like Absorption, Emission etc.

 NOTE: The Global Channel Override Sets have LOWER priority than the Global Shading Channel Overrides!
 When both are modifying the same channel, the Global Shading Channel Overrides will prevail.

Global Channel Override Sets

The Global Channel Overrides are implemented using stand-in scene objects containing one or more Krakatoa Channel Modifiers on their stack.
There can be any number of Override Sets in the scene, but only one can be active at any given time.
- This allows for multiple setups to generate various passes or production tests without having to add and remove modifiers.
- When no set is selected (--Disable Global Channel Overrides-- option on the Sets list), or if a set is selected but has been deleted, Krakatoa will not apply Global Overrides.
Press the Create New Global Channel Override Set button to create a new modifier holder in the scene. The object will be hidden and frozen, but selected in the Command Panel. A default KCM Modifier will be added to it.
To delete a Set, select it on the list (this will select it in the scene, too) and hit the Delete key which will delete it from the scene and remove it from the list.
- Note that while the UI will switch to --Disable...-- mode, internally the deleted holder object will still be stored in the Krakatoa Properties, so performing Undo after deleting the set will both restore the set and switch it active.

Global Channel Modifiers

To add a new Modifier to a set, either press the Add... button underneath the Modifiers list, or press the button in the holder object's UI in the Modify Panel of 3ds Max.
To remove a Modifier, either press the Delete button or use the Remove Modifier from the stack icon in the Modify Panel of 3ds Max.
Modifiers that are disabled will show a -- sign in front of their name.
- To toggle the Modifier's enabled state, either press the Toggle button, hold Control key and double-click the modifier on the list or use the Lamp Icon in the Stack View of 3ds Max.
- Note that the "KCM_" prefix of the modifier's name will not be shown in the Global Overrides Modifiers list to save space.
- If the modifier has any notes entered by the user, they will be displayed in [ ] brackets next to its name.
To Edit a Global Modifier in the MagmaFlow Editor, either double-click the modifier on the list, press the Edit... button or select the Modifier on the list and press its "Open MagmaFlow Editor..." button in its UI in the 3ds Max Modify Panel.
NOTE: While it is possible to add modifiers other than KCMs to the holder's stack, these will NOT be applied globally to the loaded particles.

Post Processing

Post-Divide by Alpha

When turned on, this option will tell Krakatoa to divide RGB values by the alpha value.
This ability was useful in the early versions of Krakatoa and is now considered obsolete, but it being kept around for backwards compatibility.