How to reduce noise on transparent animation? I am making an animation(in cycles render) where object is converting from diffuse to transparent(with 0.9 value on mix shader). I am using branched path tracing (with square samples)

Below is the rendering sample. All rendering is good except for the transparent part.

I am using Diffuse material with Transparent material(mix shader value changes from 0 to 0.9 in animation)

Below is the shader window.


Its taking 2mins per frame.
How to make it look perfect in this render time?
Try enabling Transparent Shadows in Properties > Render > Light Paths:



This setting enables an optimization which greatly reduces noise in shadows cast by partially transparent objects, at the cost of some speed.

Here's a comparison rendered with sampling settings identical to yours (except for the shadow setting of course).

With Shadows disabled (1:59):



With Shadows enabled (2:11):



Note that you can also disable this option per-material via the Transparent Shadows setting in Properties > Materials > Settings