I have a project set up with two objects. One of the objects is a plane with the bend deformer applied and also the collider body tag applied. The plane and bend deformer are grouped, and the collider body tag is applied to the null object.
I am making a fruit section in a grocery store.
The fruit needs to be natrually laying in the boxes.
So i added a rigid body to the fruit cloner and a collider to the boxes. they fit snuggly in, hurray ????
All was fine, but now there are so many fruit boxes that it is lagging from all the rigid body object calculations very badly!
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so far I have a working movement system using Rigidbody and the new Input System. I have it set up so that WASD passes through the input which then moves the character forward, back, left and right while also facing that direction when pressed.
One of the last areas of the old dynamics system has finally been migrated over to the new XPBD simulation system - rigid bodies! Now rigid bodies can natively interact with all of the other simulation types like cloth, ropes, soft bodies, balloons, and even Pyro! Rigid bodies was the missing piece and has very similar settings to the old system, so any C4D veterans should be able to hit the ground running with the new XPBD rigid bodies. This leaves just one last bit of the old dynamics systems to be updated - dynamic Springs, Connectors, Motors, and Force objects.
We are trying to achieve similar results in Blender. The think is that for me there is no way how to rotate object like in a Particle system along their axes, since Particle system is not collaborating with rigid body simulation.
you could let your rigidbodies blow by a wind force with disabled gravity against a couple of invisible colliders, this way they get a rotation start impulse and will keep rotating as they fly further.
To offset when a rigid body simulation starts, I would suggest that you use keyframing to your advantage. You can keyframe any option in blender, including the "Animate" and "Dynamic" check boxes in the rigid body options. Mouse over the "Animate" or "Dynamic" checkbox and press "i" like any other add keyframe.You can then make it so that only when the object is hit, or at a certain time, will the object begin to fall. Likewise, you can also use this so that your fractured objects do not fall apart until they are hit or about to be hit. Hope this helps!
Is there an easy way to perform a rigid body simulation in Grasshopper? By strange coincidence I found an image on the first Google search which brought up exactly what I want to do: put capsules in a bottle, but it was cinema 4D.
It is almost never necessary to us "fix rigid" to immobilize a
molecule. You can accomplish the same thing under NVT conditions by
integrating the equations of motion for the group of mobile atoms.
Here is an example:
+water/run.in.nvt
In this example, I define a group of frozen atoms ("Cgraphene"). The
remaining atoms are "mobile" atoms, and I apply "fix nvt" to these
atoms:
But using "fix rigid" does a significantly better job at maintaining
the correct volume. See the top graph in the two plots below:
(The black curve is the correct volume. The green curve uses "fix
rigid". The blue curve does not. They are otherwise use identical
settings.)
Steve and Trung may disagree with this approach, but this combination
works well enough for my purposes.
In any case, if you are not running simulations at constant pressure
(or if your immobilized solute is small), then we all agree that you
definitely do not need to use "fix rigid". I hope this helps.
For the NPT script I posted, the "rigid" walls move up and down in the
Z direction as the box dimensions change (due to scaling), but it does
not rotate or slide in the XY plane, or stretch in the Z direction:
+solvent+polymer_t=0-60ps.avi
The problem is that after one time step the position of the rigid body particles change a little bit but then they stay intact as is >expected from a rigid body. Any pointer to what is happening, that for the first timestep the constituent of the body are not fixed >relative to each other, is appreciated.
I don't understand your Q. You said later that you want the rigid body
to be subject to forces from all the other solvent particles, which
is the only reason to treat it as a rigid body (as opposed to just
not time integrate it like Axel suggested).
In that case, the rigid body will move over time. You can print out
its center of mass position and well as center of mass velocity and forces,
as outputs from the fix rigid command (see its doc page).
I think the only way that could happen is if you are integrating
the atoms in the rigid body more than once. E.g. if they
are also included in a fix nve or fix nvt. If you do this
you should get a warning from LAMMPS. If fix rigid
is the only integrator being used, it should not be possible
for the body atoms to change their relative orientation.
I'll add that images are not very convincing. How are you
sure that all the atoms you think are actually in the rigid
body? Have you printed/examined those coords in a dump file
to insure that have actually displaced differently relative
to each other?
I finally could find what the problem was with my simulation. I was creating the rigid body after equilibration and I was not setting the periodic flags of the constituents of the body to be all the same, basically I was not applying following note in the doc page:
I currently have a problem with my project. I am moving a character (player) with dynamic rigidbody and trying to make it collides with an other character (slime) that does not move, so with a static rigidbody. When I launch my application, first the player is blocked by the slime, but after a few seconds, it looks like the rigidbody of the slime disappeared. My character is now able to go through the slime. This is the link to my project PlayCanvas | HTML5 Game Engine
For the tentacles, an articulated rigid body dynamics engine was utilized to achieve the desired look. Each tentacle was built as a chain of rigid bodies, and the articulated point joints served as a connection between the rigid bodies. This simulation was performed independently of all other simulations, and the results were placed back on an animation rig that would eventually drive a separate flesh simulation.
Rigid Bodies Project
Contacts:Jon SuandElliot English
In conjunction with thePervasive Parallelism Lab (PPL)
With today's ever increasing amount of computational power (graphics cards,multicore processors, streaming processors, clusters, etc.), it is becomingcritical for the physics algorithms that PhysBAM relies on to fully utilitizethese computational resources. Not only will this push the boundaries ofrealism in the movie effects industry, but it will also elevate the quality ofphysics used in more resource-pressed environments, like computer games. Inthis project, our goal is to reevaluate our rigid body solver to understand whatit takes run the movie quality rigid body algorithms of PhysBAM in real-time.The first goal of this effort is to multithread and MPI the code. The othergoal of this project is to develop fundamentally new algorithms for handlingcommon rigid body phenomena, such as contact and collisions, keeping in mindthat these new algorithms must fit into the parallel framework described in thefirst goal.
Subprojects
Scalable ContactThe major problem with current contact algorithms is that they scale verypoorly when dealing with stacks of objects. For this project we areinvestigating different preconditioners for the LCP that arises in mostformulations.Realtime SimulationIn order to support realtime simulation, time evolution needs to be stable,thus avoiding spurious energy gain due to approximations in the numericalintegration scheme. In the case of rigid bodies we clamp energy during bothtorque free numerical integration and collisions guaranteeing a stable simulation.Scalable SimulationOne of our goals is to support scenes with many rigid bodies composed ofhighly detailed geometry that is too large to fit into the memory on a singlemachine. This is often the result of objects fracturing. We are exploringdistributed computing solutions, beginning by incorporating MPI into ourrigid body engine as well as multithreading locally executed routines.Papers
Su, J., Schroeder, C. and Fedkiw, R.,"Energy Stability and Fracture for Frame Rate Rigid Body Simulations",ACM SIGGRAPH/Eurographics Symposium on Computer Animation (SCA), edited by EitanGrinspun and Jessica Hodgins, pp. 155-164 (2009).
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Soft-body dynamics is a field of computer graphics that focuses on visually realistic physical simulations of the motion and properties of deformable objects (or soft bodies).[1] The applications are mostly in video games and films. Unlike in simulation of rigid bodies, the shape of soft bodies can change, meaning that the relative distance of two points on the object is not fixed. While the relative distances of points are not fixed, the body is expected to retain its shape to some degree (unlike a fluid). The scope of soft body dynamics is quite broad, including simulation of soft organic materials such as muscle, fat, hair and vegetation, as well as other deformable materials such as clothing and fabric. Generally, these methods only provide visually plausible emulations rather than accurate scientific/engineering simulations, though there is some crossover with scientific methods, particularly in the case of finite element simulations. Several physics engines currently provide software for soft-body simulation.[2][3][4][5][6][7] 0852c4b9a8
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