Point Light in SSS render

[Jaytang2828]

I tried to render the sss_bunny scene in Mitsuba. With only the environment map, 4–5k spp looks okay. But when I add a point light, even at 60k spp the image is still very noisy.

Is this normal for SSS with point lights, or do I need set up more spp? What’s the recommended way to reduce the noise in this case?

<scene version="2.1.0">

<path value="../../common"/>
<default name="integrator" value="volpath"/>
<default name="rr_depth" value="64"/>
<default name="max_depth" value="64"/>

<bsdf type="roughdielectric" id="object_bsdf">
    <string name="distribution" value="beckmann"/>
    <float name="alpha" value="0.01"/>
    <string name="int_ior" value="bk7"/>
    <string name="ext_ior" value="air"/>
</bsdf>

<medium id="medium1" type="homogeneous">
    <float name="scale" value="5"/>
    <phase type="hg">
		<float name="g" value="0.7"/>
	</phase>
    <float name="sigma_t" value="10"/>
    <rgb name="albedo" value="0.85,0.97,0.999999"/>
    <boolean name="has_spectral_extinction" value="false"/>
    <boolean name="sample_emitters" value="false"/>
</medium>

<shape type="ply">
    <string name="filename" value="meshes/bunny.ply"/>
	<transform name="to_world">
		<scale value="13"/>
		<rotate z="1" angle="130"/>
		<rotate y="1" angle="70"/>
		<rotate x="1" angle="-50"/>
		<rotate z="1" angle="-50"/>
		<rotate y="1" angle="-2"/>
		<rotate x="1" angle="12"/>
		<translate x="0.3" y="0.0" z="-0.5"/>
	</transform>
	<ref id="medium1" name="interior"/>

    <ref id="object_bsdf"/>
</shape>


<emitter type="point" id="elm__999" name="elm__999">
    <point name="position" x="10.0" y="1.0" z="2.0"/>
    <rgb value="920" name="intensity"/>
</emitter>

<include filename="include/shape_scene.xml"/>


</scene>

[njroussel]

Hi @Jaytang2828

I think you'll find some answers in this discussion: #1769