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If you want to keep a certain aspect ratio based on the current setting under “Width” and “Height”, please activate this checkbox. Now you can either enter a custom “Width” or “Height” value and RealFlow automatically completes the second value.
Maxwell Options
The Maxwell Render engine uses physical data such as time of day and location to create a physically accurate sky system. This sky model is used to illuminate the scene. The result is a naturally lit image with realistic shadows and surfaces. A click on this button opens a new window where all the relevant settings are made:
Illumination
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Intensity
This value is used to adjust the “brightness” of the sky and works like a multiplier. A higher value adds more light to the scene, lower settings result in a darker impression.
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This read-only field is a directly connected link to the “Light” slider and shows the corresponding time to the slider position.
IBL Channels (Background, Illumination, Reflection, Refraction)
These four tabs provide exactly the same parameters, settings, and buttons. “Background” specifies the image you will see in a render's background. With “Illumination” you are able to load an HDR image that acts like a global light source. An image under “Reflection” will be reflected on objects. This channel assumes that the object's material has some reflective properties. “Refraction” works similar to the previous channel, but here the node's material must not be completely opaque and have at least a small amount of transparency.
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To rotate the HDR image around the horizontal and/or vertical axes, please enter appropriate values to the two fields.
Globals
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Quality
This value determines the quality level of the render engine. Higher settings yield better images, but also need more time. The range for this parameter is between 20 and 100%. Please note that “Quality” also influences the default pixel size of the render. When the value is too low, the render process might fail and you receive a warning message. The “Quality” parameter determines the true preview size in pixels: for example 60 x 45 pixels with a value of 25. The reason why the preview is blurred is that the render will be upscaled to match the current size of the “Maxwell Interactive” window:
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Because Maxwell Render uses real world units for lighting and camera settings, the size of your scene objects must also have a real world scale. For example if you wish to render a building, but that building was exported with a size of just 1 meter, it will be rendered it as if it were a miniature building, and the lighting will not match your intentions. These differences can be compensated with “Global Scale”.
Playback
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Max Frame Time
If you want to limit the maximum render time per frame to a certain time, just enter the desired value here. The default value is 60 seconds. Please note that Maxwell will abort the render process after this time – even if the given “Sampling level” is not yet reached.
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Maxwell Render also support highly realistic motion blur. The value acts like a multiplier to stretch the blurs.
Channels
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RealFlow's implementation of Maxwell Render lets you export several channels with your render. If you want to activate this feature just switch the appropriate channel from “off” to the desired image format. The channel data is only stored with a Maxwell preview (Playback > Maxwell preview) and the "Production" engine selected. When you do a single render with the “FIRE” engine, channels will not be calculated.
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