(From version 2021.1.5 - 12.22 / 2022.1 XB2 - 13.04)
The 3dsMax Photometric 'Free Light' and 'Target Light' are now directly supported, without conversion needed.
You just need to make sure 'On-the-fly Material Conversion' in Preferences / Material is enabled.
--- Light Distribution ---
-Uniform Spherical and Uniform Diffuse creates an internal geometry with a shape as selected in the Shape section.
An internal emitting material is applied to the geometry, matching the photometric light settings.
(single sided for Uniform Diffuse)
-Photometric Web will create an IES light using the selected ies file.
-Spotlight will create an open cone geometry with an emitting disc inside the cone, resulting in a natural spotlight effect.
The 'Hotspot' and 'Falloff' angles control the shape of the cone and the depth of the emitting disc.
--- Octane settings ---
Some additional parameters are available to control the internal Octane settings of the lights :
-In Render settings, tab Support, rollout 'Photometric lights':
Those settings affect all lights of the scene, unless an Octane Geometry modifier is applied a light object.
Power Divider : Divider for converting 'Intensity' to Octane 'Power'
Power Divider IES : Divider for converting 'Intensity' to Octane 'Power', for IES lights (Photometric Web)
Spotlight cone size : Size of the cone used to create a spotlight.
Use Hotspot : For Spotlight : use the Hotspot angle to place the internal emitting disc inside the cone.
Spotlight disc size : For Spotlight, when 'Use Hotspot' is disabled: Relative size (percent) of the emitting disc inside the cone.
Render 'Point' shape : For 'Point' shape, set the octane shape visible to camera.
Shape segments : Segment count for the light shape (disc, sphere, ...)
Note: The default values (eg when switching the renderer to Octane) can be set in Octane Preferences, tab 'Vray, Corona, Std'
-In Octane geometry modifier.
The panel 'Photometric Light' has the same settings.
When 'Use modifier values', the parameters will be applied individually for each light.
Notes
-"Render 'Point' shape" also control the visibility of the spotlight cone (as it uses a 'Point' shape)
-The geometry of the spotlight cone may let some light rays to through the cone when using some Kernel types (path tracing, photon tracing).
if the result appears too noisy, you can increase the Ray epsilon value in the Kernel settings.
Samples:
sdt_photometric_samples.zip- (124.59 KiB) Downloaded 80 times
-Scene with 4 different types of photometric lights, scanline renderer.
photometLights01.max
-Same scene, using octane renderer, after global adjustments in Render settings.
photometLights02.max
-Added an Octane geometry modifier for individual adjustment of the spotlight power.
photometLights03.max
