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OSM

tools/osm·v1.5.1

IN:1 OUT:1

SUMMARY

OSM (opacity shadow map) looks at the particles from every light of a Render TOP and measures how much light each particle loses on its way through the cloud. It outputs the input points with a lit Color and a Shadow value, so dense particles darken what is behind them and colored particles tint the light that passes through.

Map Resolution, Layers and Density Scale set the shadow detail and darkness, while Scattering, Absorption, Anisotropy, multiple scattering and an ambient color shape how the cloud glows, in the same lighting model as the POPX Flow smoke. Place it last before rendering, after the simulation and modifiers; it draws the points with an internal Point Sprite MAT or any material that reads Color.

PARAMETERS

PAGEOSM

Render TOP	Rendertop	The Render TOP the particles are rendered with: its Lights cast the shadows and its Camera sets the scattering direction.
Map Resolution	Resolution	The width and height of each light's shadow map, in texels. Higher gives sharper shadows and costs more memory.
Layers	Layers	The number of depth layers per texel. They are spread from the nearest to the farthest particle of each texel, so few layers already cover the cloud.
Density Scale	Densityscale	How dark the shadows are: how much light every particle blocks (the Flow's Density Scale).
Shadow Bias	Bias	Moves the shadow lookup toward the light, in world units, so a particle shadows itself less.
Use Input Color	Usecolor	Uses the input Color as the base color of the particles. Off uses Base Color.
[+]Base Color	Basecolor	Sets the base color of the particles when Use Input Color is off.
Scattering	Scattering	Sets how much light the particles scatter toward the camera.
Absorption	Absorption	How much light the particles absorb along the ray.
Anisotropy	Anisotropy	How the particles scatter light: 0 evenly in every direction, above 0 forward (a cloud lit from behind glows at its edges), below 0 back toward the light.
Multiple Scattering	Multiplescattering	Adds the light that bounces around inside the cloud: a thick cloud gets a soft, bright interior instead of a dark core.
Multiple Scattering Amount	Msamount	Scales the multiple scattering.
Octaves	Msoctaves	The number of light bounces the multiple scattering approximates. More octaves carry light deeper into a dense cloud, for a brighter, softer interior.
Octave Depth	Msdepth	How far each bounce reaches into the cloud. Higher is a deeper, milkier glow; lower keeps the bounced light near the lit side.
[+]Ambient Color	Ambientcolor	Sets the color of the light around the cloud, the sky. It lights the particles in shadow.
Ambient Intensity	Ambientintensity	The strength of the ambient light. 0 leaves the shadowed particles black.
Material	Material	Sets the material of the particles. The internal Point Sprite MAT is used by default.
Point Size	Pointsize	Sets the point size of the particles.
Opacity	Opacity	How opaque each particle is: the alpha it is drawn with, and how much light it blocks in the shadows.

PAGECommon

Free Extra GPU Memory

Freeextragpumem

Free memory that has accumulated when output memory has grown and shrunk.

INPUTS

Input 0 POP - POPX/POP Geometry

OUTPUTS

Output 0 POP - POPX/POP Geometry