Volume Tag Basic TagTag Properties
Drag the volume material mentioned in Point 4. here.
Assigning volumes to volume channels
A volume to be rendered in Cinema 4D hast 3 volume channels that affect how the volume looks and are defined by this volume object itself or by separate volume objects - in as far as these are part of a volume set. These channels are:
- Density: How dense is the fog, fire or smoke? Does light shine through the fog or is it a thick, oily smoke?
- Color: Which color does the fog, fire or smoke have? The color can be defined using the volume object’s values (the Volume Node will assign these to the various voxel values according to the color channel defined).
- Emission: Should the fire or hot smoke emit light? If so, this is the channel you should use.
Note that the actual colors are defined in the Volume Node.
In this menu you will find all volumes listed that are contained by the object to which the tag is assigned. If this is a Volume Set, for example, it can contain any number of volume objects that will then be listed here. For a Volume Builder on the other hand, only the same Volume Builder can be selected next to None. This setting defines which volume object defines the density.
The voxel values of the volume object selected here will be defined as the volume density and adapted correspondingly to a value range between 0 and 1.
Note that the density volume object defines the expanse/scale of the volume. Other volume objects, that can be defined farther below, only work within their intersection/overlapping with the density volume.
Make sure that the volume object that defines the size, i.e., the one defined in the Density setting, does not differ greatly from those defined for Color and Emission since this can lead to long render times.
Input Min [-∞..+∞]
Input Max [-∞..+∞]
Here you can define the value range that should be converted in a range between 0 and 1. Values less than Input Min will be assigned the value 0 and values greater than Input Max will be assigned the value 1. In-between values will be assigned a corresponding value.
This setting ascertains the smallest and largest Voxel value and applies these to the settings above. This encompasses the entire value range.
Clicking on this button is generally recommended.
This setting works like the Density setting (see above), only that the volume objects defined here are applied to the Color channel. Since the coloring of the volume is often dependent on the density you will also find the Density option here. This is, of course, not always the case, e.g., for fire where the color depends on the temperature.
Input Min [-∞..+∞]
Input Max [-∞..+∞]
Here you can define the value range that should be converted in a range between 0 and 1. Values less than Input Min will be assigned the value 0 and values greater than Input Max will be assigned the value 1. In-between values will be assigned a corresponding value.
This setting ascertains the smallest and largest Voxel value and applies these to the settings above. This encompasses the entire value range.
Clicking on this button is generally recommended.
This setting works like the Density setting (see above), only that the volume objects selected here are applied to the emission channel (Luminance). The voxel clouds defined here make the volume range luminous. This can be used for white clouds that otherwise might only render gray. In the example image a white emission was defined.
Input Min [-∞..+∞]
Input Max [-∞..+∞]
Here you can define the value range that should be converted in a range between 0 and 1. Values less than Input Min will be assigned the value 0 and values greater than Input Max will be assigned the value 1. In-between values will be assigned a corresponding value.
This setting ascertains the smallest and largest Voxel value and applies these to the settings above. This encompasses the entire value range.
Clicking on this button is generally recommended.