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- Custom: allows users to set the Color and the Intensity of your light separately. Color can be set in RBG, HSV or XYZ scales, or correlated to a Kelvin value. Intensity (or Luminance) can be set in a number of different ways described later in this section. An IES / Eulumdat file using measured lighting data can be also specified.
- Temperature: in Kelvin degrees, the temperature of the light source determines both the color and its intensity. Colder temperatures (near 3000°K) emit reddish, low-intensity light, while higher temperatures (near 9000°K) emit blue, bright light.
- HDR image: high dynamic range image which emits light from the emitter surface. HDR, EXR or MXI formats are accepted.
Custom properties
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The plug-in translates Houdini’s hlight node to Maxwell Render with creating the appropriate geometry and applying an emitter material to it. The valuable used parameters are summarized in the following tabletables:
Houdini hlight node | Maxwell light geometry |
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Type: point | Sphere with radius of 0.05 |
Houdini hlight node | Maxwell light geometry |
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Type: line | Rectangle with width of 0.05 |
Area Size X | Height |
Houdini hlight node | Maxwell light geometry |
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Type: grid | Rectangle |
Area Size | Size |
Single Sided | Single / double sided surface |
Reverse Emission Direction | Surface normals when single sided |
Houdini hlight node | Maxwell light geometry |
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Type: disk | Disk |
Area Size | Size |
Single Sided | Single / double sided surface |
Reverse Emission Direction | Surface normals when single sided |
Houdini hlight node | Maxwell light geometry |
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Type: sphere | Sphere |
Area Size X | Radius X, Z |
Area Size Y | Radius Y |
Houdini hlight node | Maxwell light geometry |
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Type: geometry | Emitter is assigned to the given object, when it is translated to Maxwell. |
Render Light Geometry | Hidden from Camera, Hidden from Reflections / Refractions |
The emitter is generated from the following parameters:
Houdini hlight node | Maxwell |
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emitter material | |
Light Color | Color |
Light Intensity | |
Normalize Light Intensity To Area | Intensity translated linearly in the following intervals: [0 ; 0.1] -> [0 ; 10^4] [0.1 ; 1] -> [10^4 ; 10^5] [1 ; 10] -> [10^5 ; 10^7] Set as Luminous Intensity (Candela) for: |
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Set as Luminance for: | |
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Spot light
If the Enable Spot Light option is checked, the plug-in generates a cone with an emitting object inside, depending on the type of the light (Point light has a little sphere, Disk light has a disk, etc.). The angle of the cone is defined by the Cone Angle parameter, the penumbra angle is translated from the Cone Delta parameter. An emitter material is generated as described above and applied only on the object inside the cone. A diffuse grey material is applied on the occluder cone.