bullet physics for DS 1, 2, 3, 4 PC/Win ... teaser

mCasual

MCMXC said:

The "feet on pedals" part made me think of one thing... would be possible in the future to apply it to the pedals of a car?

the feet cycling animation did not use physics

it was made easy by using the following free scripts

mcjAutoLimb : https://sites.google.com/site/mcasualsdazscripts/mcjautolimb

mcjKeepOrient : https://sites.google.com/site/mcasualsdazscripts/mcjkeeporient

mcjHoldOn : https://sites.google.com/site/mcasualsdazscripts2/mcjholdo

mcjAutoLimb is my most important tool for animations

the physics engine will include springs and hinges,
so you could create a "real" gas pedal and push it using an invisible cube attached to a foot

mCasual

today, the standard two-bodies hinges

RAMWolff

Looks better and better.

How do you create paths like that? Not in DS or yes?

mCasual

RAMWolff said:

Looks better and better.

How do you create paths like that? Not in DS or yes?

in this case the lines and circles are simply a texture image on a plane

but on my site there's a plugin to display render paths

see

https://sites.google.com/site/mcasualsdazscripts/mcgtracepath-for-mcjtracer

https://sites.google.com/site/mcasualsdazscripts2/mcjtracerds45

in some of my images you sometimes see those lines

RAMWolff

Ah, thanks so much. Not sure when I'll have the time to play but got them both. :-)

mCasual

we know that if we make abstraction of air resistance, all objects, large and small, heavy and light as a feather all fall with the same speed profile - on Earth objects falling have an acceleration of 9.8 m/s/s, after 1 second they fall at 9.8 m/s

so ... the new thing for me is to realize that, when i see something like the image below, the fact that the movement seems slow, means that the objects are big !

i could even evaluate the size of the objects just by observing the movements

the balls are 1 meter in diameter and the swinging rod is 4.5 meters long

and this explains why a pencil falls quickly while a 100 ft tall chimney falls slowly

ghastlycomic

Casual said:

the physics engine will include springs and hinges,
so you could create a "real" gas pedal and push it using an invisible cube attached to a foot

I can't help but mentally hear a calliope playing "Entry of the Gladiators" while looking at that animated unicycle gif.

mCasual

ghastlycomic said:

I can't help but mentally hear a calliope playing "Entry of the Gladiators" while looking at that animated unicycle gif.

the acrobat skills needed to do it without a seat are Barnum and Baileyesque

RAMWolff

OMG! LMAO

mCasual

Amy still on board for more death defying experiments

( maybe i understand the bullet physics 2-bodies-hinges a bit better )

anyway, enough to include them in the inpending release

impending as in next Saturday

RAMWolff

WEEEEEEEEEEEEEEEEEE

mCasual

yes

chains

dangling

could eventually be used to indirectly animate tresses and dresses

( 3 hinges )

sjfryer_a638239a69

Rag doll physics too?

mCasual

Wyvern said:

Rag doll physics too?

there's a type of ragdoll joint / hinge n the bullet physics engine

called "cone-twist" http://bulletphysics.org/mediawiki-1.5.8/index.php/Constraints

( bullet physics engine is the open source program kit that performs the simulations )

so, i'll have a ragdoll test soon

initially it may be a stickman prop made of capsules

but i'll also try a "real" figure ... Amy may volunteer if it's minimally safe :)

example of Blender (not by me ), which uses the same engine :
http://www.youtube.com/watch?v=tiiDmr-V-D8

--
note that my system packages the physics engine as a PC-Windows .exe program
plus a Daz Script, so it's not Mac compatible except if someone will volunteer to compile my source code for the mac

another avenue i may try is to have the daz studio script
make Blender perform the simulation
which would have many advantages and most probably be mac compatible

mCasual

mile high

mCasual

math error while plotting ( insert nefarious plan here ) a trajectory

figure 2 is the same without the error

mCasual

the white stick indicates where i want a hinge to be located and its orientation
i tell the physics engine that the 2 balls are attached to this hinge

then i ... guess ... i have to tell the physics engine
where this hinge is in a green-ball-centric universe
and where it's located in a pink-ball-centric world

it almost almost works except for a jump at the beginning of the simulation

patience55

I noticed that the lollipop in "yupall" changes colour ;-)

................

For the one doing the jumping, first thought was that it would be caused by a spider! I'm sure that's helpful :-)

mCasual

Patience55 said:

I noticed that the lollipop in "yupall" changes colour ;-)

................

For the one doing the jumping, first thought was that it would be caused by a spider! I'm sure that's helpful :-)

you're the second person who saw it as a lollipop :)
in the first tests i saw the cone as jujubes

---

mCasual

well i think i figured the 2-bodies-hinges

i must specify the position of the hinge ( the now detached lillipop stick )

in the green-ball-centric universe : : [ 0, -25, 0 ] centimeters
then in the red-ball-centric universe : [ 0, -75, 75 ] centimeters

mCasual

30 seconds YT video ... for real Amy fans and nerdy physics people

https://www.youtube.com/watch?v=xbtYredDvX4

mCasual

the goal is to have a first beta version out by 6pm east coast time

with the 3 types of hinges seen so far

- object attached to the world : example Amy on the wrecking ball
- steer and roll : example the BMX wheels
- 2-bodies : example all the recent examples

and simple objects

-static objects ( example the ground-cube and the green ball
-dynamic objects - the red ball and falling cement blocs
-kinematic ( animated ) objects

RAMWolff

Looks really good there Casual!

mCasual

in case you're in a hurry and want to read the manual, as it is being written

the home of the beta release will be

https://sites.google.com/site/mcasualsdazscripts3/mcjbulletservice01

mCasual

though i'm less sure 6 pm will be the release time

lets say before midnight :)

mCasual

i will post the client script and server program in the next hour

but it will really be intended for the adventurous nerdy kind

because the manual is probably not very detailed

and there must remain bugs and quirks and it may be crash prone

( though i did not crash daz studio during development (

mCasual

i wont shout it too loud but the first beta kit is ready !

version 01

https://sites.google.com/site/mcasualsdazscripts3/mcjbulletservice01

i'll probably work on it Sunday, to improve the manual and make many test and bug fixes

it will then become version 02

( for instance, the Steer-and-roll hinge is presently not steerable at all and has hard shock absorbers )

mCasual

first thing today i'll fix the steer and roll constraint/hinge

and give access to the parameters of the steering and the suspension

mCasual

the "steer and roll" a.k.a. Type 3 /hinge was fixed

if you installed the server program

you only need to update the daz client script ( mcjPhysicsClient01.zip )

mCasual

note: there seems to be issues with scaled objects, better use non-scaled objects for now

hopefully next weekend's version will be more stable

but for now there's enough to play with !

.... later that evening ... found the issue !