We hid that light source from the camera using an Octane object tag. This created geometry which we could turn into a light source. We then skinned them using the XP skinner object. To do this we took each light sweep and dropped the particle count down to around 1,000-2,000 particles per second. We had to come up with a way of faking it. You can get X-particle shader to talk with the C4D standard renderer, but it doesn’t look great. Doesn’t matter what renderer you decide to use it won’t be able to use that light sweep data as a light source. We were using octane to render the rest of the scene but one problem we faced is with Krakatoa you can’t get the light FX to light and affect the geometry in the scene. Even using the subframe sampling in x-particles did not solve this. Using frame rates of 30FPS or below gave hard lines of interpolation as the object moved along its curved spline. We were using anything between 60-90FPS depending on how much we thought we wanted to be able to slow down the sweeps in post. But for compositing reasons we rendered each sweep individually – this meant in post we could retime the sweeps as much as we wanted.Īnother thing we had to do to make sure the sweeps came out looking smooth was bump up the frame rates. We usually had 6 sweeping light effects in each scene so around 12 million particles created per scene. In most of the scenes the particle count was 2 million per sweep. We added a Krakatoa mesh tag to the text geometry so that Krakatoa only rendered the particles that you can see. We used the ‘force additive mode’ and density values of around 3×10-3. It does a great job at smoothing out the look. We rendered the particles using Krakatoa. This creates the nice crossovers as the light FX add on top of each other and emulates how light painters create their images when they do this ‘in camera’. We added a vibrate tag on the objects emitting particles so that whilst the swept through the length of the spline they rotated and scaled in an organic looking way. This is how we created the streaky effects and the colour gradient sweeps. Where the colour in the gradient was set to black the particles don’t emit. For the object textures we used gradients in the colour channel. The lifespan of the particles was set to around 30F. The emitted particles have zero velocity, so they stay where they are in space. The particles emit from an object, specifically the texture of that object, which itself is moving along a spline. The light effects were created using X-particles.
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Krakatoa does look better though.* The Light Painting Effects – how we did itįor the full story we’ve created a Cinema 4D Light FX video tutorial. *you don’t 100% need Krakatoa – the light FX can also be rendered using X-particles. In the end we developed a workflow using used X-Particles & C4D, rendered with Krakatoa*. In the world of endless tutorials, we managed to find a technique that hadn’t been covered. We couldn’t find a road map for this technique online so had to work it out for ourselves. Hence, we were asked to see if there was a way we could reproduce the effect in 3D. You need a lot of post work, and sometimes that post work will leave artefacts which you can’t get rid of. Light painting effects look amazing, check out Patrick the Light Painter, he’s unbelievable at it: īut, the nature of the technique, with long camera exposure times, makes it difficult to create a video. They asked us if we could emulate the effect of light painting. We were approached by The Croc, a marketing agency who are just next door to us in London. Hope you enjoy the write up and video, drop us your comments and questions! Tutorial:Ģ2:00 Faking scene lighting using X-Particles Skinner Object & Octane We’ve taken so much from the motion graphics community through watching other people’s tutorials we’re happy we have something to give back. Sorry for waffly video – use the timing links below to find the bits you need. Hello, welcome to Grizzle’s first ever blog post tutorial on Light Painting Effects in Cinema4D. Light Painting Effects in C4D using X-Particles & Krakatoa
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