TUTO: Projector Tweet

[calus]

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Texture Projector Light is quick to setup but not so obvious :
- Use a simple plane as mesh light projecting a texture with Persp Projection along the Z axis.


- create a plane with normal oriented to Z
- apply an Octane diffuse material
- add an Emission texture node in the Emission attribute
- add a texture in the Emission pattern attribute
- add a perspProjection node in the texture,
- add a transform3D in the Projection node with default values (local space coordinate is important so we can manipulate the projection by manipulating the plane).

You can then control the projector with the scale attributes of the plane,
this is a bit confusing but is similar to scaling a SpotLight,
scaling uniformly change power emission and blurriness,
scaleX /scaleY control the ratio (or can also be controlled by a 2dTransform node)
ScaleZ axis control the frustum of the projector.
to have crisp projection you need to keep the plane small and increase the emission.

[Renart]

Thank you so much Calus, this is very good!

I used to do something like this before but this is way more simple!

With a white disk on black background texture, and withe the Texture Wrap Around put on clamp, we can have a good and easy to use spotlight! You just have to adjust the intensity everytime you change the scalling but being able to change the aperture with a simple scale Z it's wonderful!