pyrocluster cinema 4d 9 用户手册
PYROCLUSTER
REFERENCE 13
Trans. Limit settings
The Trans. Limit settings are available only when Render Mode is set to User.
See also ‘How are PyroCluster effects created?’ earlier in this chapter.
These parameters offer another way to speed up render times. They determine the
cut-off value for the Volume Tracer engine. Usually the volume is traced deeply until
the transparency of a point is 0, i.e. it is 100% opaque. However, most of the time
you won’t see any change in the result if the Volume Tracer stops some way before
this 100% opaque cut-off value. Numbers between 1% and 10% are normally fine
and help greatly in speeding up render time.
the transparency of a point is 0, i.e. it is 100% opaque. However, most of the time
you won’t see any change in the result if the Volume Tracer stops some way before
this 100% opaque cut-off value. Numbers between 1% and 10% are normally fine
and help greatly in speeding up render time.
RayTrans. Correction
RayTrans. Correction enabled
(left) and disabled (right).
As explained in the previous section, if you increase the transparency cut-off value
used by the Volume Tracer (the Ray Trans. Limit value) you gain render speed. However,
some artefacts may appear when using Ray Trans. Limit to the extreme. In these
cases you should enable the RayTrans. Correction, which will attempt to correct these
problems — see the images above.
some artefacts may appear when using Ray Trans. Limit to the extreme. In these
cases you should enable the RayTrans. Correction, which will attempt to correct these
problems — see the images above.
Disabling RayTrans. Correction means that the volume effects will render more
transparently as you increase the Ray Trans. Limit This happens because the rays
traveling into the volume are stopped before they become 100% opaque. PyroCluster
uses the transparency value as it is set in the Limit box. To prevent this, enable the
RayTrans. Correction parameter.
transparently as you increase the Ray Trans. Limit This happens because the rays
traveling into the volume are stopped before they become 100% opaque. PyroCluster
uses the transparency value as it is set in the Limit box. To prevent this, enable the
RayTrans. Correction parameter.