人类起源与进化:英译中4--有关服装的，求高手

Figure 4: Pre-positioning and simulation oftrousers under a shirt.property statesisDressedAfter(shirtB,trousersA).In order to reverse the setting we only have tochange the property toisDressedAfter(trousersA,shirtB).Figure 5 shows the results after changing theproperty and restarting the pre-positioning andsimulation.Figure 5: Pre-positioning and simulation of ashirt under trousers.In Figure 6 a pullover, which is given thename pulloverC below, is worn over the shirtand the trousers. By specifying in our ontologythat the collar of the shirt is worn above every-thing else, this pattern remains on top, whereasthe rest of the shirt is hiding under the pullover.Using the name collarP for the collar this canbe formally defined byisDressedAfter(trousersA,shirtB),isDressedAfter(pulloverC,trousersA),isDressedAfterP(collarP,X)for all patterns X of the pullover. Please notethat we simulated the whole shirt and not onlythe top of it. This can be seen for instance in thearea of the legs where the trouser is bulging dueto the textile material of the shirt.In order to get robust simulations for severallayers of garments we had to improve on thephysics-based layer. This will be described inthe next section.Using the physics-based layer yields the de-sired result—if the virtual garments have a “rea-sonable size” for the given 3D-geometry of avirtual human.As can be seen in reality when young chil-dren try to get dressed, it is not a priori clearwhich is the front part and which is the backpart of the garment. We can easily simulatesuch a mistake of wearing a dress with the frontpart at the back. In Figure 7 we show the ex-ample of a simple dress, which solely consistsof patterns lying on the torsoAndLegs hulland for which the one specifying waist tohip point left is changed to waist tohip point right. Without any further in-teraction the pre-positioning algorithm and thephysics-based end-positioning computes a dressworn with the front part at the back.Similarly, for garments involving sleeves wecan abstractly specify whether the left sleeve isworn on the left arm or on the right arm etc.3.2 Cloth-cloth collision detectionOne problem in cloth modeling is the efficientand robust collision detection between severallayers of garments. Previous approaches haveused various algorithms for solving this prob-lem, all of which were relying purely on the ge-ometry of the cloth meshes. In our approach weare also using a standard method for self colli-sion detection. Additionally, we use the infor-mation given by our ontology in form of theproperty isDressedAfterP. Our approachis motivated by the fact that for most garments a5