Merge the Terragen RGB render element, such as the tgRGB, in additive mode.Merge the inverted chromatic alpha channel with the non-Terragen render element, setting the Apply Mode to multiply.Invert the chromatic alpha channel by adding a Channel Boolean node, with its Operation mode set to negative.Then merge any Terragen RGB render elements on top using Additive mode.
To use the chromatic alpha channel, you first need to multiply an inverted version of it over the non-Terragen background render element. This is called a “Chromatic” alpha channel, and by using the RGB channels instead of the familiar alpha channel, which only contains one value per pixel, you have more accurate control over any post production changes you might want to make, especially to the cloud layers and atmosphere. In Terragen, the Rayleigh scattering feature takes into account that the atmosphere’s opacity can vary at different wavelengths, and this information can be recorded in the red, green and blue channels of a rendered image. TgRgb = tgSurfRgb + tgAtmoRgb + tgCloudRgbĪ question often asked is “Why does the alpha channel image contain colour values?” and “How do I use it?”
The simplest example of combining render elements to match the Terragen beauty pass, which is sufficient for many projects, is this: In the Nuke software, this means setting the merge node to "Plus", while in the Fusion software, this means setting the merge node's "Apply Mode" to "Normal", "Operator" to "Over", and "Alpha Gain" to "0.0".
TERRAGEN BLUR IMAGE NODE SOFTWARE
The compositing project should be set up in linear colour space and you will use an "Additive" workflow approach, which means setting the render element's merge or blending mode to the equivealent of "additive" in your 2d software package. Rebuilding the Image from Lighting Elements Ĭompositing with Terragen's render elements allows you to recreate and fine-tune the final rendered image or "beauty pass".
The image might not use the exact camera values for the frame. Even with motion blur turned off on the renderer, it still uses the shutter window to calculate motion vectors (if output) and always renders an image that is centred in the shutter window so that the rendered image can be properly motion blurred in post. However, turning off motion blur on the renderer is not quite the same as turning it off on the camera. Note for Terragen versions 2.5 to 4.4: To render motion blur in Terragen, motion blur must be enabled on the render node, not just the camera. Use of 2D Motion Blur, Ambient Occlusion lighting, or any Post Effect in your scene file will also prevent tile rendering, as none of those features can. Choosing the correct shutter offset may be important if Terragen renders need to be composited with tracked footage or output from other renderers. 0.25 shutter offset with the default motion blur length of 0.5), the motion blur will be centred on the current frame. If, instead, you set shutter offset to -0.5 times the motion blur length (e.g. A shutter offset of 0 (the default) causes the shutter to open exactly on the frame number and close at frame + motion blur length. Shutter offset: Offsets the time (in frames) at which the motion blur shutter opens and closes.Other values can be chosen, even those outside the range 0 to 1, but it is very unusual to go outside this range in animations. This is not possible in a real camera, but if it were it would be equivalent to a 360-degree shutter, or a shutter of 1/24 second in a 24 FPS video.
TERRAGEN BLUR IMAGE NODE FULL
If motion blur length is 1, the shutter will be open for the full duration of time that the camera moves between one frame and the next. It produces motion blur similar to a 180-degree shutter in a film camera, or a shutter of 1/48 second in a 24 FPS video. If motion blur length is 0.5 (the default) the shutter will be open for exactly half the amount of time that the camera moves between one frame and the next. If motion blur length is 0 there will be no motion blur, regardless of how fast the camera is moving. Motion blur length: This is the total length of time (in frames) during which the camera's shutter is open, affecting how much motion blur is visible when the camera is moving.Terragen does not support object motion blur yet, only camera motion blur. Motion blur and Depth of Field are only available in licensed versions of Terragen. The Blur tab of the Camera node has settings relating to motion blur and depth of field.
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