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Credit VDB: EmberGen Simulation | Jangafx
Volumetric Simulations
Volumetric fluid simulation tools such as EmberGen by JangaFX allow the real-time simulation of fire, smoke and explosions. OpenVDB is a library and file format for the interoperability and storage of volumetric data. This means that OpenVDB files generated by EmberGen or other simulation software can be easily imported into other compatible applications (e.g. Blender) for rendering. In the video example, a simulation of a ground explosion by EmberGen was imported into a Blender file with tracked drone footage. For added realism, a textured plane was added to serve as a light catcher for the frozen lake. In addition, a light catcher was also added to the window nearest to the explosion.
Credit 3D model: BlenderKit | Dadadesign
Motion Tracking for VFX
Blender includes powerful motion tracking technology that allows users to follow the movement of objects or cameras in video footage. This capability is required for integrating dynamic 3D elements that follow the motion of real-world objects, making it an important tool for VFX. In the video example, drone footage of Platamon Castle in Greece was analysed with Blender’s motion tracking tools and solved for camera motion. After setting the ground level and the scale of the scene, a 3D model of a statue was added on top of the octagonal tower. Holdouts were added to ensure that battlements closest to the camera appear in front of the statue. The direction, intensity and colour of the artificial sunlight were adjusted to match those of the footage.
Credit HDRi: Andreas Mischok | https://polyhaven.com
Simulation of water droplets
There are several methods for simulating liquids in Blender. Two methods that work well in small-scale settings with water droplets containing air bubbles are demonstrated in this example. The first methodology is based on work by Albin Merle. Water droplets were simulated using Metaballs whereas Geometry Nodes were utilized to simulate the air bubbles. The second methodology is based on work by Owen Jenkins. In this instance, water droplets were simulated using cloth simulations and particle systems were used to simulate the air bubbles. To obtain proper refraction for both simulations, the “Normals” of the air bubbles were flipped. Dispersion was also included.