I can see bright pixels in grass!

In case the bright spots are caused by sun being reflected by the grass blades, this is a physically correct phenomenon that you can also observe in real life (examples: waves on the water reflecting sun, "sparkling" snow).

Examples



Example of bright pixels visible in grass:
glossiness = 1.0






To decrease this effect, you can:


1. Lower glossiness value of the grass material:


Glossiness lowered from 1.0 to 0.5 in 3ds Max and Cinema 4D:



After lowering material's glossiness to 0.5, sun reflections became "softer" and more realistic:






...or...


2. Disable reflection visibility for Corona Sun in 3ds Max and Cinema 4D:





Result of disabling sun's reflection visibility:

There are no bright pixels but the grass looks less realistic. Using this option will globally disable sun reflections for all objects.





Other solutions


In post-1.3 versions of Corona, highlight clamping in 3ds Max / highlight clamping in Cinema 4D can be used to clamp the brightest parts of the image and thus get rid of fireflies and noise.