The VRayAColorOp texture performs an arithmetic operation between two colors and/or textures. This texture is useful for blending textures and colors without the need for a separate V-Ray Blend material.
In the example here, the candle holder is shaded with a V-Ray Material that is set up to imitate brass. We also add a Coat layer, where we apply a VRayAColorOp texture. For Color A, we apply a V-Ray Curvature texture and set its Mode to Concave. For Color B, we add a green-blue color to imitate patina. We set the Mode of the VRayAColorOp to Sum. This way, we have a base of a brass material, and we are adding a layer of a colored Curvature texture on top, which imitates weathering of the brass. Without the VRayAColorOp texture, we would need to create two separate materials - one for the brass and one for the patina and attach them to a V-Ray Blend material.
Color A– Specifies the first color. A Texture can also be applied, and it can be blended with the color using the Mix Strength parameter.
Mult A– A multiplier for Color A.
Color B– Specifies the second color. A Texture can also be applied, and it can be blended with the color using the Mix Strength parameter.
Mult B–A multiplier for Color B.
Alpha from Input – When enabled, the alpha value is derived from the Color A shader. In case the Mode is set to Result B, the alpha is derived from the Color B shader.
Result Alpha – Determines a value that overrides the alpha value in the output.
Mode – Specifies the calculation method for the two colors/textures. The selected mode determines the data being output when the Output parameter is set to Default.
Result A – Returns the value of A (color_a*mult_a). Result B – Returns the value of B (color_b*mult_b). Product – Performs a multiplication operation and returns the product (A*B). Sum – Performs an addition operation and returns the sum (A+B). Difference – Performs a subtraction operation and returns the difference (A-B). Power – Performs an exponentiation operation and returns the power (A^B). Division – Performs a division operation and returns the quotient (A/B). Minimum – Performs a comparison and returns the minimum value. Maximum – Performs a comparison and returns the maximum value. Absolute Difference – Performs a subtraction operation and returns the difference as an absolute value (abs(A-B)). Lower Intensity Color – Returns the value of whichever Color parameter has the lowest intensity. Greater Intensity Color – Returns the value of whichever Color parameter has the greatest intensity. Sin – Performs a sine function and returns the result (sin(A)). Cos – Performs a cosine function and returns the result (cos(A)). Abs – Returns the absolute value of the first argument (abs(color_a*mult_a) Ceil – Performs a ceiling function that rounds up to the next integer that is equal to or greater than the largest argument - A or B (ceil(A)); (ceil(B)). Exp – Performs an exponential function (ea+b). Floor – Performs a floor function that rounds down to the next integer that is equal to or smaller than the smallest argument - A or B (floor(A)); (floor(B)). Log – Performs a natural logarithmic function (ln(A)). Log 10 – Performs a common logarithmic function (base 10) on the first argument (log(A)). Sqrt – Performs a square root function (√A). Fmod – Performs a division operation and returns the remainder (A%B). Average – Returns the average of A and B (((color_a*mult_a)+(color_b*mult_b))/2). Tan – Performs a tangent function and returns the result (tan(A.0)). Asin – Performs an arcsine function and returns the result (asin(A). Acos – Performs an arccosine function and returns the result (acos(A)). Atan – Performs an arctangent function and returns the result (atan(A)). Atan 2 – Performs an arctangent function with two arguments and returns the result (atan2(A,B)). Bias Schlick – Performs a faster bias approximation, described by Christophe Schlick, based on the original definition by Kenneth Perlin.1 Gain Schlick – Performs a faster gain approximation, described by Christophe Schlick, based on the original definition by Kenneth Perlin.2 Bias Perlin – Implements the original bias definition by Kenneth Perlin.3 Gain Perlin – Implements the original gain definition by Kenneth Perlin.4
