When light refracts through or reflects off of a surface, these bent rays are focused together, creating a bright pattern referred to as a caustic.  
| Refractive Caustic | Reflective Caustic | 
|---|
|  |  | 
| The light refracts through the wine glass. | The light reflects off the gold ring. | 
In addition to reflective and refractive, there are two other types of caustics:  
| Indirect caustics | Caustics created by indirect lighting (scene illumination). | Indirect refractive caustics are always on in SOLIDWORKS.  | Indirect reflective caustics are always off in SOLIDWORKS. | 
| Direct caustics | Caustics created by direct lighting, including spot or point lights. | 
Directional lights do not affect direct or indirect caustics.
Direct caustics are only visible when reflected off a floor appearance or real geometry.  To turn on direct caustics, click  and use the PropertyManager.  Direct caustics are only visible in the final render image.