Create Projectors Fast (Blender Tutorial)
Why Blender Stack Exchange recommends it
Blender Stack Exchange users link it as the base method for simulating a projector, then ask follow-ups or share fixes for problems like distortion, noisy volumetrics, and mirror bounces.
Recommended by 1 people across 1 different months, 2022 to 2022.
What it is
A short Blender tutorial by CGMatter showing how to build a video-projector effect using a spotlight and a node setup that projects an image through the light. It covers the shader nodes needed to get a sharp, correctly mapped projected image in Cycles.
What people said
Recommends Marcel · 2022-04 · Blender Stack Exchange · on “Correcting perspective distortion for an angled projector (Keystone effect)”
I don't know if this is the mathematically correct way to do it, but this worked for me: [LINK] Based on a video from CGMatter: [this video] The nodes additionally modify the Z value before dividing to achieve a perspective correction. This is done by multiplying the X or Y value of the normal vector by the amount of correction desired and then adding it to the Z value. This is the result: [LINK]
Cites Dan Xmas · 2022-01 · Blender Stack Exchange · on “Weird Patchy Cycles Render when I use Principal Volume & Light”
I used a spotlight to make a projector based on a tutorial I used ( [this video] ) and I keep getting these patchy results even when I render to 1000 levels in Cycles. I'll include my render/light settings, this can't be as simple as just turning up the levels which kinda helps. [LINK] [LINK] [LINK] [LINK] [LINK]
Cites user123511 · 2022-01 · Blender Stack Exchange · on “How to get rid of Pincushion Distortion of Projector?”
According to this tutorial [this video] the solution to the distortion is to use the node setup in screenshot 2. However, the nodes completely mess up the image. Is there any other solution to get the edges straight? [LINK] [LINK]
Cites Casey Scalf · 2022-09 · Blender Stack Exchange · on “How to Make a Mirror that Bounces / Reflects Spot Light as a Projector Would?”
Playing around and enjoying this method to simulate an image projection as a video projector would in Blender. Using this tutorial [this video] . I am now trying to see how it might be possible to simulate "bouncing" this image off of a mirror type surface or material in Blender? The idea being it would act as a real life projector beam bouncing off of a mirror would such that the reflected image is still in focus. So far I have only been able to get the image to be a very diffuse reflection. See screen shot. Is this simply a setting in the material portion of the mirror or is it deeper than that? Thank you for any tips! [LINK]