Volume Source Operations: The merging operation.

Copy: Values in the Target Field will be overwritten by those in the Source Volume.

Add: Result is the sum of values in Target Field and Source Volume.

Subtract: Result is the difference between values in Target Field and Source Volume; the difference can optionally be clamped against zero by enabling Avoid Negatives.

Multiply: Result is the product of values in Target Field and Source Volume.

Divide: Values in the Target Field will be divided by the corresponding values in the Source Volume.

Maximum: Result is the larger of the values in Target Field and Source Volume. For vector fields, comparison can be performed length-wise by enabling Use Vector Length.

Minimum: Result is the smaller of the values in Target Field and Source Volume. For vector fields, comparison can be performed length-wise by enabling Use Vector Length.

Average: Result is the average of values in Target Field and Source Volume.

Pull: Values in the Target Field are pushed towards the corresponding entries in Source Volume, in accordance to settings of Acceleration Strength, Deceleration Strength, and Direction Strength.

Blend: Result stored in the Target Field is (s * v + d * w) / (v + w), where s, v, d, w represent values of the source, source weight, target field, and target weight, respectively. Additionally, the values of source weight are added to the target weight field.

None: The Target Field is left untouched.