Guillem Ramisa de Soto
Digital Compositing & CGI
GR_Reflect
BlinkScript based node that produces reflections from a world normals aov and an environment map.
The node is designed to work with an equirectangular enviorment map with a aspect ratio of 2:1
The mapped environment can be rotated along a 3D axis and offseted in 2D.
A facing ratio mask can be enabled to produce a more realistic effect. A camera or an Axis is required to work properly.
NODE SETUP:
The node has tree inputs but two are required by default:
env: Should be a equirectangular environment map. 2:1 Aspect ratio.
norm: Rendered world normals aov. An alpha channel should be available with this input so it can be premultiplied.
A third input (cam) is available to use the Facing Ratio feature.
The camera used to render the normals aov should be set as the input. However a custom camera or an Axis can be used as well for further tweaking.
The output resolution is set to root.format as default, but it can be changed in the setting tab.
NODE CONTROLS:
The GR_Reflect has seven control knobs:
Normals: Select the channel to use as the normal map.
premult: given an alpha channel it will multiply the output by the alpha.
Multiply: Control the luminance values of the output reflection.
Rotation: 3D matrix rotation of the projected environment map.
Offset: 2D offset of the input environment map.
Facing ration: Sets active the Gamma knob to control the facing ratio.
Gamma: Gamma control for the facing ratio masking.
EXAMPLES:
Render AOV: World Normals
Equirectangular environment map
Output premultiplied and with facing ratio
Output reflection
Rendered Beauty
Merged reflection + beauty
The node contains a blink script node that uses a method to project the environment map with an angular projection into a polar coordinates with a spherical latlong unit space.
The current version is v1.0.1 and it works with non equirectangular maps for the environment input, but further exploration can be done to warp/distort the image. Blurring the environment map can be achieved by creating a blur node after the environment image node, however a box or gaussian blur can be implemented inside the blink script node.
You can find the RAW code here: GR_Reflect
