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I would like to make a scene where a movie projector displays an image onto a wall but the image will get projected onto obstacles or even characters that pass between the projection wall and the projector. I have no clue how to accomplish this effect in Blender or even someway to do it in post.

I don't even know if it is possible.

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    $\begingroup$ Try UV project modifier. $\endgroup$
    – Jaroslav Jerryno Novotny
    Commented Oct 1, 2016 at 18:46
  • $\begingroup$ Connect a texture to a point light's color attribute. $\endgroup$
    – Henricus V.
    Commented Oct 1, 2016 at 19:46

2 Answers 2

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In your scene, add a lamp as the type spot.

With the lamp object selected go into the texture panel, under the lamp texture, add a texture with your image. You probably want to set Extension to Extend. Set the coordinates to object and input the lamp as the mapping object.

enter image description here

You can also set the spotlights shape to a square by ticking Sqare in the lamps settings.

enter image description here

Even overlapping projector lamps work.

image projection from spotlight

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  • $\begingroup$ That is just beautiful. $\endgroup$
    – Eric Huelin
    Commented Oct 2, 2016 at 13:37
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    $\begingroup$ I am trying to pull of something similar in Cycles. This in BI works nice, however the image does not scale with distance of the light, which is a bummer. Didn't find a solution for it. $\endgroup$
    – Jaroslav Jerryno Novotny
    Commented Feb 25, 2017 at 20:47
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To scale the image according to distance you can use Drivers applied to the Scale values of the Mapping node.

enter image description here

To add a Driver to a value just Right-Click on its field and select Add Driver option, or press Ctrl+D.

enter image description here

In the Driver Property panel :

  1. use a Transfrom Channel type ( the one with the icon : (x) ) as the Driver variable,

  2. set a reference object (mine is named Plane),

  3. set the type to one of the axes (here I set it to Z Location as the lamp is facing down on the Z axis),
  4. fine tune the effect in the Expression field. Here you are mapping the Z Location values to Scale values, so they need to be scaled down (0.2, moving the object 1 meter along Z axis will change the Scale by 0.2) and maybe inverted (-1) with particular positioning

enter image description here

Here are my results (bottom plane is the reference, watch the other two move and behave naturally) :

enter image description here enter image description here enter image description here

Notice how I can set the full image scale by moving the bottom plane (which was the Plane object reference in the Driver property panel), so it is similar to a real life situation when you are adjusting/setting the projector zoom to a background wall.

enter image description here enter image description here

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