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Jawset TurbulenceFD for C4D: Intuitive Fluid Dynamics inside Cinema 4D
Jawset TurbulenceFD for Cinema 4D Simulate fire, smoke, dust and other gaseous phenomena available directly in CINEMA 4D. Jawset TurbulenceFD for Cinema 4D is designed to be easy to use, optimized
for performance and produce very high quality results.
Voxel-Based Gaseous Fluid Dynamics
Jawset TurbulenceFD for Cinema 4D's simulation pipeline implements a voxel-based solver based on the incompressible Navier Stokes equations. That means it uses a
voxel grid to describe the volumetric clouds of smoke and fire and solves the equations that describe the motion of fluid on that grid. For each
voxel TurbulenceFD calculates the velocity of the fluid as well as several channels to describe properties like temperature, smoke density,
amount of fuel, etc. This simulation process produces a voxel grid for each frame, which is cached on disk for use by the Volumetric Renderer.
To setup a fluid simulation, the artist uses any type of geometric object or particle system to paint the sources of smoke, heat,
fuel, etc. in space. The flow then carries along these emissions in a physically plausbile way that creates the realistic look of fire,
explosions, vapor, clouds, dust and much more.
Pull all the stops on your CPU
The biggest technological challenge in fluid simulation is the handling of the large amounts of data that a sequence of voxel grids
requires. That is why Jawset TurbulenceFD for Cinema 4D's simulation pipeline has been designed from the ground up to optimize performance. This includes a careful selection
of efficient numerical methods that provide high accuracy and stability throughout the simulation pipeline. And implementing this pipeline using
the latest High Performance Computing technology to optimally exploit Memory Caches, Multi-Core CPUs and advanced vector instruction sets. To the
artist this means that more iterations can be run in less time, making the work with fluids more intuitive and productive.
Up to 12x speedup on the GPU
10 minutes instead of 2 hours! And there's a simple reason for that: today's high-end GPUs have 8-15 times the memory throughput of
high-end CPUs. TurbulenceFD exploits that. It features a hybrid CPU/GPU simulation pipeline that achieves enormous speedups. Unlike some GPU
based tools, this is not just a stripped down version of the CPU simulation. All features are supported at the same quality. When GPU memory is
exceeded, TurbulenceFD switches back to the CPU on-the-fly. This allows you to achieve close to real-time speeds for low resolutions and scale
smoothly to high resolutions in the hundreds of millions of voxels. Instead of carefully changing parameters, sending off the simulation job and
not seeing the results for hours, fluid simulations can be tweaked in quick iterations with the artist observing the effect of the changes while
the simulation is processing.
Physically Based Fire Shader
Getting the colors right is critical when creating believable fire animations. You can design your color gradients manually for full
artistic control. If you want realistic fire colors, the process of tweaking the colors directly can be time consuming and tedious, though. So
the fire shader simulates realistic high dynamic range fire colors based on the Black Body Radiation model. This model is controlled by only two
temperature values. It generates the colors real fire would have at these temperatures. But Jawset TurbulenceFD for Cinema 4D doesn't stop you there. You may want realistic
colors, but need more flexibility to tweak the enormous dynamic range that fire has. Maybe give the reds a boost, compress the dynamic range a
little, or just use the generated colors as a starting point to edit the directly again.
In a nutshell, Multiple Scattering is Global Illumination for smoke. It's a way to light smoke more realistically and brighter, since
it's illuminated from all directions. It also allows fire to illuminate smoke from the inside, which is essential for realistic shading of
explosions. Unlike many Global Illumination techniques, Multiple Scattering in Jawset TurbulenceFD for Cinema 4D does not add noise and thus works well with for animation. And
Multiple Scattering render times in Jawset TurbulenceFD for Cinema 4D are actually affordable. But if you're in a hurry you can still dial in a compromise between speed and
The heart of fluid dynamics is the creation of a sequence of velocity fields that describe the complex, characteristic motion of the
fluid. You can use Jawset TurbulenceFD for Cinema 4D's velocity caches to control the movement of particle systems. This allows you to complement the voxel renderer with
debris or sparks or just render the particles by themselves.
Jawset TurbulenceFD for Cinema 4D constantly tries to minimize the volume that needs to be processed in order to save memory and time. The velocity field is
analyzed to make sure only those parts of the volume will be clipped that will not affect the flow in subsequent frames. If necessary you can
control the sensitivity of the clipping for each fluid channel.
Emitters are to fluid simulation what brushes are to painting. If an object is set on fire, it emits heat and a flame. Jawset TurbulenceFD for Cinema 4D lets you
use any geometric object or particle system to emit into fluid channels. This gives you the ultimate freedom for shape and animation of your
emitters. Working with emitters in Jawset TurbulenceFD for Cinema 4D is like animating the brush strokes that paint the sources of fire, smoke, etc. The fluid simulation then
takes your animated emission and creates a physically plausible flow from it.
Letting the fluid flow interact with solid objects is useful in many scenes. From a simple solid floor to vehicles moving through
fire and smoke to animated characters on fire. Not only is it necessary to integrate the simulation into an environment, but it creates nice and
natural turbulence in the wake of an object. Collision objects can stir up the fluid, wave it to the side or act as an obstacle. Jawset TurbulenceFD for Cinema 4D also
supports collision objects with all kinds of complex animation including MDD imports and object controlled by rigid body dynamics.
Shading Curve Editor
The heart of voxel shading are the function curves (f-curves) that re-map values like temperature and density to intensity values
used for opacity and color. Jawset TurbulenceFD for Cinema 4D features an f-curve editor that has been specifically designed for voxel based fluid shading. It allows for
precise and intuitive control, making it very similar to the workflow of color correction, which many artists are already familiar with. And
since the f-curves have to be evaluated billions of times during rendering, a special type of spline curve has been designed for Jawset TurbulenceFD for Cinema 4D that is
particularly efficient for voxel rendering.
Adding procedural noise to the fluid velocity field is a way to get curly flows that look more turbulent and more interesting. The
controls work pretty much like a procedural noise shader that is commonly found in texturing tools. However, adding the turbulence uniformly
across the whole volume will stir up the core of an explosion just as much as the parts further away from the violent reaction. This doesn't make
much sense. So Jawset TurbulenceFD for Cinema 4D lets you to control where exactly you add curls to your flow using one of the fluid channels and a simple mapping curve. This
way turbulence can be added only certain regions like the core of an explosion or the hot part of a flame for example.
The OpenGL based preview gives you a detailed look at each of the fluid channels in real-time. Several shading modes are supported in
the preview. There's an analytic mode that provides a detailed look at the raw output of the simulation. And there are shaded modes that give you
real-time feedback while tweaking the settings of each shader. In addition to the fully 3-dimensional preview modes, you can display a 2D slice
of the voxel grid, oriented and positioned anywhere in the volume. This can be thought of as the magnifying glass of the preview modes and it's
comparable to a wireframe view of geometric objects.
Voxel Grid Compression
To help cope with the large simulation data, Jawset TurbulenceFD for Cinema 4D features lossless data compression that has specifically been designed for fluid
data. It typically reduces voxel data down to about 60% in practice.
Controlling how fire is ignited and how fast a flame propagates in Jawset TurbulenceFD for Cinema 4D is just as easy and flexible as painting fluids with emitters.
It can be based on any fluid channel, not just temperature. This avoids the balancing act you have to perform if temperature also drives the
buoyancy force that let's the hot gas rise.
Often you work out the simulation at a low or medium resolution that allows for quick iterations. Then, you would want to simply re-
simulate at a higher resolution to get the final result. But that may not only add high-res detail but also slightly change the large-scale
motion due to the numerical nature of the simulation. Up-Res'ing is a way to keep the exact shape and motion of a low- or medium-res simulation
and only add high-res detail to it. It's also faster than running a full simulation at the same high resolution.
With Render Time Sub-Grid Detail Jawset TurbulenceFD for Cinema 4D pushes the Up-Res'ing approach even further. Instead of having to run a second pass on your base
simulation, you just add the high-res detail to your result at render time. For extreme settings this is not as flexible as Up-Res'ing, but it
doesn't require the additional simulation pass or additional cache memory either.
In order to work properly, your copy of Jawset TurbulenceFD for Cinema 4D requires :