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Invisible light in Iray (how to make?)

Dave McHDave McH Posts: 49
in Daz Studio Discussion

Hello! I have a little problem when I use light.

The light source reflects and blocks elements of model. Like spacesuit but instead of face and reflection of environment you see huge rectangular.

The question is simple but I still can't find the answer. So, how can I create INVISIBLE source of light. I know that you can disable rendering for spot light, but if it has diameter even thou it will be visible as reflection.

Creating transparent emitting panel also didn't work.

Looking forward for your advice!

Comments

  • Richard HaseltineRichard Haseltine Posts: 100,784

    Use a piece of geometry (e.g. a one division plane from Create>New Primitive), apply the Iray Emissive shader, and set Cutout Opacity to a very low but non-zero value (Surfaces pane)

  • Dave McHDave McH Posts: 49
    Richard Haseltine said:

    Use a piece of geometry (e.g. a one division plane from Create>New Primitive), apply the Iray Emissive shader, and set Cutout Opacity to a very low but non-zero value (Surfaces pane)

    Oh! Thank you! Now I understand why it didn't work. I used 0 for it. Now it works, thank you again!

  • alteregoalterego Posts: 0

    When searching for solutions to a very similar problem, not wanting bright discs to show up in the render, I mainly see references to ghost lights using geometry.

    Is there a reason people don't just toggle the "Render Emitter" setting on lights?  Was that setting just not available in older versions (currently using 4.21), or are there other benefits/drawbacks I'm missing?

    Using the "Render Emitter" setting currently lights the scene, but the source doesn't show up in the render.  Toggling "Visible in Render" means the light is totally removed from the scene.

     

  • Richard HaseltineRichard Haseltine Posts: 100,784

    alterego said:

    When searching for solutions to a very similar problem, not wanting bright discs to show up in the render, I mainly see references to ghost lights using geometry.

    Is there a reason people don't just toggle the "Render Emitter" setting on lights?  Was that setting just not available in older versions (currently using 4.21), or are there other benefits/drawbacks I'm missing?

    Using the "Render Emitter" setting currently lights the scene, but the source doesn't show up in the render.  Toggling "Visible in Render" means the light is totally removed from the scene.

    Ghost Lights did not show in rflections of direct view. The render Emitter setting affected only direct view. The latst version of Iray, not yet available in a public version of DS, does appear to add a way to hide things from relfections and/or direct view with an officially supported "ghostlight" system.

  • johndoe_36eb90b0johndoe_36eb90b0 Posts: 235

    Richard Haseltine said:

    alterego said:

    When searching for solutions to a very similar problem, not wanting bright discs to show up in the render, I mainly see references to ghost lights using geometry.

    Is there a reason people don't just toggle the "Render Emitter" setting on lights?  Was that setting just not available in older versions (currently using 4.21), or are there other benefits/drawbacks I'm missing?

    Using the "Render Emitter" setting currently lights the scene, but the source doesn't show up in the render.  Toggling "Visible in Render" means the light is totally removed from the scene.

    Ghost Lights did not show in rflections of direct view. The render Emitter setting affected only direct view. The latst version of Iray, not yet available in a public version of DS, does appear to add a way to hide things from relfections and/or direct view with an officially supported "ghostlight" system.

    Richard, any ETA on public beta with this new Iray? Is there any chance we get it before next year?

  • DoctorJellybeanDoctorJellybean Posts: 8,464

    johndoe_36eb90b0 said:

    Richard Haseltine said:

    alterego said:

    When searching for solutions to a very similar problem, not wanting bright discs to show up in the render, I mainly see references to ghost lights using geometry.

    Is there a reason people don't just toggle the "Render Emitter" setting on lights?  Was that setting just not available in older versions (currently using 4.21), or are there other benefits/drawbacks I'm missing?

    Using the "Render Emitter" setting currently lights the scene, but the source doesn't show up in the render.  Toggling "Visible in Render" means the light is totally removed from the scene.

    Ghost Lights did not show in rflections of direct view. The render Emitter setting affected only direct view. The latst version of Iray, not yet available in a public version of DS, does appear to add a way to hide things from relfections and/or direct view with an officially supported "ghostlight" system.

    Richard, any ETA on public beta with this new Iray? Is there any chance we get it before next year?

    Updated Public Beta with the new Iray

    https://www.daz3d.com/forums/discussion/601796/daz-studio-pro-beta-version-4-21-1-26/p1

    And more info on the Ghost Light in the updated Iray

    https://www.daz3d.com/forums/discussion/609556/creating-a-ghost-light-daz-studio-4-21-1-26#latest

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