ILM and VFX partner Hybride collaborated to produce a high-energy bus chase scene in Luc Besson’s Valerian and the City of a Thousand Planets. Here, Valerian and Laureline race to board a bus that is then attacked by a menacing Megaptor creature. ILM visual effects supervisor Philippe Rebours runs down the work involved.
On-set shoot: When they’re outside the bus we shot that on the set where it was a school bus that has been set-dressed and you see them jumping into it. Then we swap to three shots where it’s fully CG where he transforms into this armour bus, and then you see them driving away. At that point, we’re inside the bus. For that, we shot it completely blue screen.
The interesting aspect is, because a school bus is pretty small, they built another bus that was slightly bigger, but using the same seats and the same stage and they recreated the front with the wheel and all this kind of stuff, except that there was a little bit more space so the mercenaries who were helping Valerian and Laureline, they could stand up and shoot.
So, we are on this blue screen and with this open-cut bus. The actors would shoot pretending that the creature is arriving and little by little we would remove some elements as if the creature is punching through the roof. So, we’d remove a portion of the roof that we replace with CG, and then we remove some of the seats because the creature was going to throw them away. By the end of the sequence, the full interior is CG interior.
Crafting the creature: From the artwork we saw that there was a sort of shell on it that looked very much like a crab, but he had other areas that move freely and he has these spikes as well. What we did is, for on the look itself we took photos of elements and we say, ‘Okay, the shell looks very much like crab. Use the foot of the crab as reference,’ but we had turtles for the skin in between.
Animating a Megaptor: We had a professor, Dr. Stuart Sumida, who is a biology professor at the California State University, who came and he gave a talk on how animals move and why, based on their skeletons. We looked at the Megaptor skeleton physiology and then the way he has to – his front legs are really strong, really heavy, and the back legs are a bit smaller, let’s say. That told us that we wanted to go towards hyena moves because they generate power from their front limbs, but the posture was very much like a bull dog, so it’s a mix of those two for the movement.