condition

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Condition is a utility node that allows you to switch between two colors or textures, depending on a simple mathematical relationship between two input values. If the relationship (Greater Than, Less Than, Equals, Is Not Equal To, etc) is true, then the first color or texture is output. If the relationship is false, then the second color or texture is output.

You can use Condition nodes for many different purposes. Some examples:

• You could create a shader that changes to a different color when an object goes above a certain height. To do this, connect the Translate Y attribute of the object to First Term, set Second Term to the desired height, and set Operation to "Greater Than". Set ColorIfTrue to red and ColorIfFalse to blue, and connect the OutColor attribute to the object's shader. Now, when the Y value of the object goes above the desired height, it will change color from blue to red.
• In a slight variation, you can create a texture where the parts of the texture above a certain height are one color, and the parts below are another color. Create a Sampler Info utility node, and connect its Point World Y attribute to First Term. This will give you the position of each point on the texture, rather than the position of the whole object. Set Second Term to the desired height, and set Operation to "Greater Than".
• You could create a texture that is like a marble texture, but turns black in all the areas where the marble is too red. To do this, connect the Marble's Out Color R attribute to First Term, and set Second term to the desired red threshold value (say, 0.75). Connect the Out Color attribute of a marble texture to ColorIfFalse, and set ColorIfTrue to black. Set Operation to "Greater Than". Connect the OutColor of the Condition node to your shader.

Note: The Condition node is completely unrelated to the "condition" command found in the MEL scripting language.

In general, the operation of the Condition Node is this:

     IF ( First Term OPERATION Second Term ) THEN
         Out Color = Color If True
     ELSE
         Out Color = Color If False

In the table below, important attributes have their names listed in bold in the description column.

This node is MP safe

colorIfFalse, colorIfFalseB, colorIfFalseG, colorIfFalseR, colorIfTrue, colorIfTrueB, colorIfTrueG, colorIfTrueR, firstTerm, operation, outColor, outColorB, outColorG, outColorR, secondTerm

Long name (short name)	Type	Default	Flags
operation (op)	enum	0
Operation is the test that is performed between the First Term and Second Term attributes. If the test is true, Out Color is set to ColorIfTrue. If it is false, Out Color is set to ColorIfFalse. The possible operations are: Equal Not Equal Greater Than Greater Or Equal Less Than Less or Equal
firstTerm (ft)	float	0.0
First Term is the first term of the if condition. (See description at top).
secondTerm (st)	float	0.0
Second Term is the second term of the if condition. (See description at top).
colorIfTrue (ct)	float3	0.0, 0.0, 0.0
ColorIfTrue. The color or texture that will be output by this node when the condition is True. See description at top.
colorIfTrueR (ctr) float 0.0 The red component of ColorIfTrue
colorIfTrueG (ctg) float 0.0 The green component of ColorIfTrue
colorIfTrueB (ctb) float 0.0 The blue component of ColorIfTrue
colorIfFalse (cf)	float3	1.0, 1.0, 1.0
ColorIfFalse. The color or texture that will be output by this node when the condition is False. (See description at top).
colorIfFalseR (cfr) float 0.0 The red component of ColorIfFalse
colorIfFalseG (cfg) float 0.0 The green component of ColorIfFalse
colorIfFalseB (cfb) float 0.0 The blue component of ColorIfFalse
outColor (oc)	float3	0.0, 0.0, 0.0
Out Color. This is set to Color IfTrue when the condition is True, and to Color IfFalse when the condition is False.
outColorR (ocr) float 0.0 The red component of Out Color
outColorG (ocg) float 0.0 The green component of Out Color
outColorB (ocb) float 0.0 The blue component of Out Color