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Posted 19 February 2004 - 05:11 PM
in other words, lets first ask (state) the problem.
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-we need a realistic movement that creates an illusion of force against an object with (reliatively) some mass and densisty that it actually dosen't have.
then we need to hypothosize (brain storm) an outcome and try to visualize a ragdoll effect in real life (easily done with k-nex dudes
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-in the world of 'the real' velocity plays a key role on inertia and rotation. IE. if a person is hit in the chest with a 50 pound wieght flying at a velocity of 30kph (excluding pain and body damage) his body will do the following. first the torso will arc away from the projectile, wthe arms will bed at the elbows and move up towards the chest(already 7 joints have been mentioned. elbows {2} shoulder{2}
torso {3}) . then the current position of the legs will manuvere in the same way of the arms but towards the the direction of the projectiles pervious velocity. that is the legs will ben at the knees {2}. then the head will arc towards the chest {1}. after that its time for momentium to kick in along with rotation and inertia. the entire body will rotate away from the projectile (clockwise if coming from the left and vise versa) with equal velocity but descreasing momentum, after that inertia will spread the limbs apart (like gravity versus friction does to sky divers) and out wards.
torso {3}) . then the current position of the legs will manuvere in the same way of the arms but towards the the direction of the projectiles pervious velocity. that is the legs will ben at the knees {2}. then the head will arc towards the chest {1}. after that its time for momentium to kick in along with rotation and inertia. the entire body will rotate away from the projectile (clockwise if coming from the left and vise versa) with equal velocity but descreasing momentum, after that inertia will spread the limbs apart (like gravity versus friction does to sky divers) and out wards.
thus will be the outcome of a projectile hiting a human chest at 30kph . now that the 'rag doll' effect has been explained we just need to hypothosize a solution to the problem. how would we do it?
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-joints are the main issue, thankfully if one is to think, three-dimensional engines are not needed for this. imaging an arm cut off at the elbow and the shoulder.
if this limb is rotated (shoulder in the center) a radius is created (the length of the arm) . therefor two joints are seen, the elbow at
dx = x + (radius * cos(image_single*30 * 3.14 / 180));
dy = y - (radius * sin(image_single*30 * 3.14 / 180));
instance_create(dx,dy,elbowjoint)
and the shoulder at 0 (bounding x sign in sprite editor menu)
thats pretty baisic limb function (radius = the length of the are from shoulder to elbow)
the lower arm can be placed at the elbow joint (in step event jump to elbowjoint.x,.y)
if this limb is rotated (shoulder in the center) a radius is created (the length of the arm) . therefor two joints are seen, the elbow at
dx = x + (radius * cos(image_single*30 * 3.14 / 180));
dy = y - (radius * sin(image_single*30 * 3.14 / 180));
instance_create(dx,dy,elbowjoint)
and the shoulder at 0 (bounding x sign in sprite editor menu)
thats pretty baisic limb function (radius = the length of the are from shoulder to elbow)
the lower arm can be placed at the elbow joint (in step event jump to elbowjoint.x,.y)
so there ya have it, the same function can be done for the rest of the joints.
all that we need now is to figure out how to make thus function work for MULTIPLE objects. and of course the code that states the ragdoll effect for each limb as stated above.
we can do this if we work as a team
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Jay! I've made an example! This time it's very life-like rubber-rope with a giant iron ball at the end! You can swing it! whoa!
You press space to change directions - but do see the default collisions first.
) armature, we can go and think about forces...
