"Clonal Mosaic" redirects here. For clonal mosaicism in genetics, see Mosaic (genetics).
MClone,[1] or Clonal Mosaic, is a pattern formationalgorithm proposed in 1998 used specially for simulating the visible patches of color in the fur of giraffes and members of the Felidae of the mammalians. It was primarily proposed as a 2D model[2] and lately was extended to 3D.[3] An important feature of the algorithm is that it is biologically plausible.
Since the algorithm was created in order to address some of the problems with texture mapping, its main goal is to produce, with the same set of parameters, a variable number of color patterns for a 2D or 3D object model. This way, for a relatively big amount of different entities represented by the same model, instead of using the same texture (and, doing so, each object would be equal to the others), one could use the different color patterns created by the MClone algorithm. Another useful feature of MClone is that it can be used to create patterns along with growing data of the object model.
The algorithmedit
The MClone algorithm, essentially, works as follows: given the 3D model of the object which we want to create a new pattern, we first randomly place n cells on the model's surface. Each cell has a type, which defines many cell's properties, including its color. This way, for instance, if we want to simulate a pattern that has only two colors, we should use just two types of cells.
Now that the model has the defined cells, and they are placed randomly, we want them to create a pattern. For this to happen, we make relaxations between all cells. We have two fundamental parameters in these relaxations: the mitosis rate of each cell type (which indicates the delay in days for the cell type multiplication) and the adhesion rate of each cell type to the others (and to itself too). This last one is a number smaller than 1 that subtracts from the resultant force of the relaxation (thus, keeping the cells together).
Each relaxation happens has a defined "day" in which it occurs (this is the way MClone calls the relaxation process). The number of relaxations per day is defined at the beginning of the algorithm. The mitosis rate is defined as a number that indicates in how many days a cell is going to reproduce "again". For example, if the mitosis rate of a given cell type is 4, the cells of that cell type are going to reproduce themselves in average every 4 days (i.e., for a cell born in the first day, it reproduces itself in the fifth day, and in the ninth day, and so on).
Passed a given number of days, we are going to have a well defined pattern, which can be, or not be what we were waiting for. Although it could not seem intuitive through the explanation above, an important feature of the algorithm is that it is easy to predict how it will become a pattern just after taking a look at the parameters passed to the algorithm.
Referencesedit
^Walter, M. (December 1998). Integration of Complex Shapes and Natural Patterns (Ph.D. thesis). University of British Columbia. CiteSeerX10.1.1.89.5497.
^Walter, M.; Fournier, A.; Reimers, M. (June 1998). "Clonal mosaic model for the synthesis of mammalian coat patterns". Proceedings of Graphics Interface 1998. pp. 82–91. CiteSeerX10.1.1.6.1013.
^M.Walter, A.Fournier, and D.Menevaux. 2001. Integrating shape and pattern in mammalian models. Proceedings of SIGGRAPH 2001 (August), 317-326.
mclone, clonal, mosaic, redirects, here, clonal, mosaicism, genetics, mosaic, genetics, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, this, article, unsourced, material, c. Clonal Mosaic redirects here For clonal mosaicism in genetics see Mosaic genetics This article needs additional citations for verification Please help improve this article by adding citations to reliable sources in this article Unsourced material may be challenged and removed Find sources MClone news newspapers books scholar JSTOR June 2011 Learn how and when to remove this template message MClone 1 or Clonal Mosaic is a pattern formation algorithm proposed in 1998 used specially for simulating the visible patches of color in the fur of giraffes and members of the Felidae of the mammalians It was primarily proposed as a 2D model 2 and lately was extended to 3D 3 An important feature of the algorithm is that it is biologically plausible Since the algorithm was created in order to address some of the problems with texture mapping its main goal is to produce with the same set of parameters a variable number of color patterns for a 2D or 3D object model This way for a relatively big amount of different entities represented by the same model instead of using the same texture and doing so each object would be equal to the others one could use the different color patterns created by the MClone algorithm Another useful feature of MClone is that it can be used to create patterns along with growing data of the object model The algorithm editThe MClone algorithm essentially works as follows given the 3D model of the object which we want to create a new pattern we first randomly place n cells on the model s surface Each cell has a type which defines many cell s properties including its color This way for instance if we want to simulate a pattern that has only two colors we should use just two types of cells Now that the model has the defined cells and they are placed randomly we want them to create a pattern For this to happen we make relaxations between all cells We have two fundamental parameters in these relaxations the mitosis rate of each cell type which indicates the delay in days for the cell type multiplication and the adhesion rate of each cell type to the others and to itself too This last one is a number smaller than 1 that subtracts from the resultant force of the relaxation thus keeping the cells together Each relaxation happens has a defined day in which it occurs this is the way MClone calls the relaxation process The number of relaxations per day is defined at the beginning of the algorithm The mitosis rate is defined as a number that indicates in how many days a cell is going to reproduce again For example if the mitosis rate of a given cell type is 4 the cells of that cell type are going to reproduce themselves in average every 4 days i e for a cell born in the first day it reproduces itself in the fifth day and in the ninth day and so on Passed a given number of days we are going to have a well defined pattern which can be or not be what we were waiting for Although it could not seem intuitive through the explanation above an important feature of the algorithm is that it is easy to predict how it will become a pattern just after taking a look at the parameters passed to the algorithm References edit Walter M December 1998 Integration of Complex Shapes and Natural Patterns Ph D thesis University of British Columbia CiteSeerX 10 1 1 89 5497 Walter M Fournier A Reimers M June 1998 Clonal mosaic model for the synthesis of mammalian coat patterns Proceedings of Graphics Interface 1998 pp 82 91 CiteSeerX 10 1 1 6 1013 M Walter A Fournier and D Menevaux 2001 Integrating shape and pattern in mammalian models Proceedings of SIGGRAPH 2001 August 317 326 External links editMClone at Google Code Retrieved from https en wikipedia org w index php title MClone amp oldid 1180746494, wikipedia, wiki, book, books, library,
