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YafaRay4tS is the result of several months of hard work by many members of the trueSpace scripting community. If you use YafaRay4tS please consider donating $5 or $10 to support this project.

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YafaRay4tS Main UI Help

The main user interface is divided up into 6 panels:

Background Settings Panel

YafaRay4tS Background aspect

Background type - Background shader type to use: Constant, Gradient, Image, or SunSky.

Color -Color to use for Constant background shader.

Power - Power of light cast by the background.


Use IBL - Use the background as a lighting source. Use background on the "Default" tab must also be checked.

Probe - Set background image type to light probe.

Sphere - Set background image type to spherical projection.

IBL samples - Number of samples to be taken when doing lighting calculations from background image.

Rotation - Horizontal rotation of background image.


Sky color - Zenith color.

Ground color - Ground color.

Sky Horizon color - Sky horizon color.

Ground Horizon color - Ground horizon color.

Sun Sky

Use Sun - Turn sun on or off.

X - X component of Sun vector postion.

Y - Y component of Sun vector position.

Z - Z component of Sun vector position.

Power - Amount of light sun adds to scene.

Background light - Use background in light calculations.

Turbidity - Controls the density of particles in the air. The higher the value the more sunlight will be diffused into the sky.

Horizon Brightness - Controls the brightness of the horizon colors.

Spread - Controls the edge transition of the horizon.

Sun Brightness - Controls the brightness of the sun.

Sun Size - Controls the size of the sun.

Backscatter - Controls the sun's color appearance and that of the halo around it.

Sun Sky

Fog Type - Selects the fog type.

Step Size - Sets the step size value.

Adaptive - Turns adaptive fog calculation on.

Optimize - Turns optimize on.

Turbidity - Fog density.

Alpha - Fog alpha parameter.

Sigma - Fog sigma parameter.

Continue to YafaRay Setup Panel