This material is designed to be applied to particles that have a Sprite POP to generate the attributes determining the size and orientation of the sprite billboards. It contains the appropriate procedural to stamp billboards on each sprite.
Shading is done isotropically. The material will be lit independently of its normal, thus making it ideal to simulate smoke or fire.
This material relies on procedural noise rather than a texture map.
Parameters
Color
Diffuse Intensity
Contribution of the diffuse term to the shading, used by PBR to scale the light contribution.
Use Base Color
Determines if Base Color contributes to the sprite color.
Base Color
This color is multiplied by the final color, providing a tint to the sprite.
Tint with Color Attribute
If set, the Cd attribute will be multiplied into the final color.
Opacity Intensity
Global control of the opacity of the sprites.
Opacity
Global control of the RGB opacity of the sprites.
Tint with Alpha Attribute
If set, the Alpha attribute will be multiplied into the final Opacity. If no Alpha Attribute exists, Opacity is unaffected.
Specular Intensity
Global control of the specular shading.
Specular Color
This color is used to determine the color of the specular highlights.
Noise
Noise Type
Determines the type of noise that is used in the material.
Frequency
The scale of the noise pattern. Larger values give smaller, but not more detailed patterns.
Offset
This vector positions the noise on the object in x,y, and z
Amplitude
The bounds of noise function, in the case of original Perlin noise, -1 to 1, are multiplied by this Overall Scale.
Roughness
This value sharpens or softens the edges of the noise. Lower values are softer, higher values sharper. Sharper edges may cause aliasing issues in motion.
Attenuation
This value shifts the median value of the noise. Values greater than 1, will dampen the noise down, whereas values less than 1 will sharpen the contrast between the noise values.
Turbulence
This value controls the amount of details in the noise. This is the number of times the noise function is called and summed. If the Frequency is high, there is no need for much detail, 1 or 2 should be plenty. This can affect the Amplitude of the noise as well since the smumming will result in higher base values.
Geometry
Geometry
Controls the parameters for the sprite procedural that creates a camera-facing sprite for each particle. The size and orientation of the sprite are controlled by attributes on the particle that are set with the Sprite POP. The velocity attribute controls if motion blur is done and what point attribute will be used as the velocity. The FPS is used to determine the length of the motion blur - higher values will perform a shorter blur. Note that the motion blur settings of the output driver will be ignored! Attributes lists the point attributes that will be passed from the particles to the surface shader.