Rag doll physics simulation - NCCA People A-Z

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EQUATION 22: RELATION OF DISTANCES BY MASS RATIOThis leaves us to believe that by combining Equation 21 and Equation 22 we can get thedistance for body as indicated by Equation 23 and Equation 24 (Millington, 2007).EQUATION 23: DISTANCE OF CHANGE IN POSITION AFTER INTERPENETRATIONTo get the direction where bodythe equation. (See Equation 24)will travel to, the contact normal ( ̂) has to be included intôEQUATION 24: DISTANCE OF CHANGE IN POSITION AFTER INTERPENETRATION WITH DIRECTIONAL VECTOR4.5. Types of contactAs mentioned earlier there are 3 types of contacts for bodies in a 3D world: point contact, edgecontact and face contact.4.5.1. Point contactIn a computer generated simulation a point contact is considered the contact that occurswhen a body that has a shape with small corners with which it comes into contact with anotherbody, like in Figure 8 (Millington, 2007).Point contactFIGURE 8: POINT CONTACT BETWEEN TWO BODIES4.5.2. Edge contactThe edge contact refers to a body that touches another contact with two points from its bodythat represent a side of the colliding body (Millington, 2007). (See Figure 9)22
Edge contactFIGURE 9: EDGE CONTACT BETWEEN TWO BODIES4.5.3. Face contactFor contacts that occur with bodies that have curved shapes we usually have face contactsbecause that means that their faces are curved as well. An example of this is a body that has asphere shape like a tennis ball. At the moment when the ball hits the surface of a table, eventhough it might look like a point contact because there is only one contact occurring betweenboth bodies, it is known as a face contact because the whole face of the ball is hitting thetable, as seen in Figure 10 (Millington, 2007).Face contactFIGURE 10: FACE CONTACT BETWEEN TWO BODIESHowever, curved shaped bodies are not the only ones that can have a face contact with otherbodies. Any body may have a face contact depending on the circumstances, but all points ofthe face have to be in contact with the opposing body at the same time for it to be considereda face contact. As another example, imagine a box hitting the floor flat on one side. This wouldbe considered a face contact, because the four points that a side of a box consists of are incontact with the floor at the same time.5. Ragdoll DynamicsRagdoll Dynamics is the implementation of rigid body dynamics and spring forces that acttogether to visualize a simulated representation of the skeleton of a human body without themuscular characteristics interacting with its environment visualizing the reaction of the bodyinteracting with external forces present in the simulated environment.Considering that the body is only constructed with bones and joints that connect the bonestogether and determine the angular limit of the bones it behaves more like a doll made out ofrags and not a real human body, so this type of simulation is known as ragdolls for theirsimilarities.23
Page 1 and 2: Rag doll physicssimulationVictor Fr
Page 5 and 6: 5.2. Joint ........................
Page 7 and 8: List of FiguresFigure 1: Two object
Page 9 and 10: 1. IntroductionComputer Graphics ha
Page 11 and 12: 3. Newton’s laws of motionIssac N
Page 13 and 14: 3.3. The third law of motionThe las
Page 15 and 16: ody on a surface, after which the b
Page 17 and 18: dimensional axis for each coordinat
Page 19 and 20: ⃗⃗⃗⃗⃗⃗⃗⃗⃗⃗FIGUR
Page 21: 4.4.5. Collision DetectionCollision
Page 25 and 26: Rotation on X axis Rotation on Y ax
Page 27: 6.2. Class Diagrams6.2.1. Collision
Page 31 and 32: 7. ConclusionRagdoll dynamics is a

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