KR102366693B1 - Cage Weight method using Proxy Modeling and DeltaMush - Google Patents

Abstract

The present invention relates to a cage weight method using proxy modeling and DeltaMush technique, and weighting is implemented using proxy modeling. By finding character modeling vertices around proxy modeling and applying weighting,
The present invention has a remarkable effect of smooth processing without distorted shape in joints and joint areas by the cage weight method using proxy modeling and DeltaMush technique.

Description

Cage Weight method using Proxy Modeling and DeltaMush}

The present invention relates to a cage weight method using Proxy Modeling and DeltaMush technique, and more specifically, a cage weight tool for effectively applying weighting was developed. Proxy Modeling) to implement a new method to effectively apply weighting,

It is a cage weight method using Proxy Modeling and DeltaMush method, which are the optimal weighting methods that are easily and conveniently applied by additionally using the DeltaMush method.

In general, many weighting plug-in tools developed recently are implemented by applying the weight value as a ratio to the modeling vertex that is close to the joint position.

In the prior art Registered Patent Publication No. 10-1775839, data is changed through a plug-in program that provides a graphical user interface for the part to be modified in the modeling created in a software program that can create a virtual character and can edit or synthesize animation. and then, based on the input data, calculate and process the modeling lattice through a script to optimize the transformation to create a more sophisticated operation of modeling, and apply the skin weight to parts that are difficult to apply in modeling. It is possible to obtain the final output based on the input data by simply applying the skin weight,

The graphical user interface providing method for applying the lattice to skinweights of the present invention is a graphical user interface (GUI) that is convenient for converting into skinweights after applying a lattice by selecting a joint and a geometry. , provides a plug-in program that provides a graphical user interface) In addition, there is a composition that has a remarkable effect to reduce unnecessary time during character setup, transform the separated modeling to be intuitive, and apply a grid that can be applied differently according to the character's characteristics and propensities to skin weight by using options. is disclosed.

In addition, according to the method and apparatus for automating character rigging through rigging duplication of Patent Registration No. 10-1102778 as a prior art, providing an original model of an original character and an original rigging and a target model of the target character; selecting, for each of the mesh of the original model and the mesh of the target model, corresponding points for morphing from the mesh of the original model to the mesh of the target model; calculating a surface correlation between the mesh of the original model and the mesh of the target model and generating a morphing cage through crossmesh parameterization of the meshes based on the corresponding points; Through cage-based deformation operation based on the surface correlation and morphing cage, spatial correlation between the three-dimensional position of the spaces inside the mesh of the original model and the three-dimensional position of the spaces inside the mesh of the target model calculating a relationship; calculating three-dimensional positions and properties in the target model corresponding to the three-dimensional positions and properties of the rigging elements of the original rigging by using the spatial correlation and the surface correlation between the original model and the target model; and generating a target rigging based on the three-dimensional position and properties of the calculated rigging element in the target model.

However, many recently developed weighting plug-in tools are mainly implemented by applying the weight value as a ratio to the vertex of the modeling that is close to the position of the joint. no. Also, certain parts of modeling are parts that come into contact with multiple joints, so it is difficult to decide which joint to apply the weighting value to.

Depending on the character's characteristics and tendencies, the method of painting with the paint skin weight varies a lot, so it is difficult to implement automatically. Since character weighting is still a field that has to be painted by hand, it takes a long time to work, so an effective weighting method was invented.

Although many weighting tools are currently being developed, there are still many parts that need to be manually processed. As shown in FIG. 1 , which is a prior art, two bind methods are presented on the Maya interface.

The Closest Distance method is a method set as the Maya default default. As in the picture Closest distance, problems such as a specific area (a problem of back distortion) and distortion of the shape of the foot occur. The Geodesic Voxel method is a newly designed method to solve these problems, and although the shape of the bridge has improved a lot, many problems still occur. As shown in the figure Geodesic Voxel of Fig. 1, head and back distortion problems occur. Therefore, as shown in the figure, there is a disadvantage of having to apply additional paint weighting to correct the distorted shapes.

Therefore, the present invention was devised to solve the above problems, and in order to supplement the problems of the existing waiting, the proxy modeling is used to apply the weighting value, and the advantages of the DeltaMush function are extracted and additionally applied to the waiting proxy. This is to provide a cage weight method using modeling and the DeltaMush technique.

The present invention relates to a cage weight method using proxy modeling and DeltaMush technique, and weighting is implemented using proxy modeling. It is characterized by finding character modeling vertices around proxy modeling and applying weighting.

Therefore, the present invention has a remarkable effect of smooth processing without distorted shape in joints and joint areas by the cage weight method using proxy modeling and DeltaMush technique.

1 is a diagram of two proposals [Closest distance] [Geodesic Voxel] of a bind method on a conventional Maya interface
Figure 2 is a Cage Weight procedure diagram of the present invention
3 is a DeltaMush principle diagram
4 is a procedure diagram of integrating the weighting applied by DeltaMush of the present invention into one skin weight node.
5 is an explanatory view of weighting through the cage weight of the present invention

The present invention relates to a cage weight method using proxy modeling and DeltaMush technique, and weighting is implemented using proxy modeling. It is characterized by finding character modeling vertices around proxy modeling and applying weighting.

In addition, it is characterized in that it uses the delta ignore technique to soften the joints and joint areas, extracts the softened values, and applies them to the character skin weight.

In addition, it features the use of getWeight and setWeight of Maya API to implement copying and pasting weight values to a specific joint.

The present invention will be described in detail with reference to the accompanying drawings as follows.

1 is an explanatory diagram of two binding methods [Closest distance] [Geodesic Voxel] on a conventional Maya interface, FIG. 2 is a cage weight procedure diagram of the present invention, FIG. 3 is a DeltaMush principle diagram, FIG. 4 is this view A procedure diagram of integrating the weighting applied by DeltaMush of the present invention into one skin weight node, FIG. 5 is an explanatory diagram of weighting through the cage weight of the present invention.

That is, the present invention has developed a method of applying weighting using proxy modeling in order to overcome the problems of these distorted shapes as shown in FIG. 2 .

Apply proxy modeling to character modeling. Rebuild Cage Modeling by increasing proxy modeling. Easily create Cage Modeling using the existing ProxyModeling automation creation tool,

In the shape of each Cage Modeling part, 3D character modeling vertices are found and weighted.

Use DeltaMush to soften hard parts.

To delete unnecessary delta ignore nodes, copy and apply delta ignore weights with good weighting to existing characters (use Bake Deformation to skin weights to apply).

Clear Delta Ignore Node

As shown in Fig. 3, the DeltaMush method is a built-in tool designed by Maya to smoothly handle hard weighting (angular weighting) as shown in the figure.

You can see that a deltaMush node is created in the input of the channel window on the right of the figure. It is necessary to integrate the deltaMush node and the skin cluster node for application of character deformers later.

4 shows a procedure for integrating the weighting applied by DeltaMush into one skinweight node.

Two identical modeling and joint and weight creation as shown in the picture from rigid weights via cage. Delta Mush applied to one of the two. Copy the weights by applying Bake Deformation to Skin Weights to the character without Delta Mush from the character with Delta Mush applied.

Copy the weights through Maya API getWeight, setWeight in order to copy the weights to the correct joint position on the final character in the modeling where the weights are copied.

As shown in FIG. 5, weighting through cage weight applies weighting effectively and appropriately without distortion of shape compared to the existing Closest distance or Geodesic Voxel method.

The present invention will be described in detail as follows.

A new method of assigning a weight value to a character using proxy modeling, unlike the existing weighting method, is attempted.

Even multi-joint areas where it is difficult to apply a weighting value are effectively processed by proxy modeling. In the past, manual weighting was desperately needed for the multi-joint part, but it solved the problem that was difficult to apply by using the already created proxy modeling.

How weighting is applied

1. Increase the proxy modeling size to include high-resolution modeling vertices to which the surrounding skin weight is applied.

2. Grown up proxy modeling is called cage modeling.

3. In the cage modeling created for each joint position, the vertices are extracted and the weight of each joint position is given.

4. As a method, the points existing in the cage modeling are extracted by applying the Maya API test_if_inside_mesh.

5. Apply 100% weighting to each joint position of the extracted points.

6. The formula to be applied is to use the skinPercent command of the Maya Python reference, but the Maya API setWeight is applied due to the slow operation speed.

7. Assign the weight values of the vertices in the cage modeling to every joint part.

8. Since 100% of each joint location joint value is applied, the deformation looks hard. The DeltaMush technique is used to gently deform the joints and points in the joint area.

9. The DeltaMush technique has many problems due to the characteristics of the node, so it is necessary to extract the deformed weight values smoothed through DeltaMush again and apply it to the skin weight.

10. There are two ways to apply skin weights.

First, there is a method of utilizing the 3D character motion realization technique using a plug-in program that converts 3D character motion previously registered by the present applicant as registered Patent Publication No. 10-1775839. Applies a weighting ratio to the skinweight with the transformed distance value.

Second, the DeltaMush weight value is a method that utilizes Maya's Bake Deformation to skin Weight command. However, in order to apply the weight value well, this method has difficult conditions such as the problem that the number of joints and vertices identical to the skin weight must not overlap the joint position (based on Maya 2018, 2019, 2020). In order to properly assign weighting values, additional work is needed. The additional work process is as follows.

Additional work is required because there are many problems in extracting weight values from skin weights directly from characters whose deformation has been smoothed with DeltaMush. Same character addition applied with DeltaMush. The additional method copies the same character and joint and gives the same weight value.

To the added character, apply Bake Deformation to skin Weight from the existing DeltaMush character to extract a soft weight value.

From the character extracted from the soft weight value, it is applied to the final character with getWeight and setWeight of Maya API.

Therefore, the present invention has a remarkable effect of smooth processing without distorted shape in joints and joint areas by the cage weight method using proxy modeling and DeltaMush technique.

Claims (3)

It implements weighting by using proxy modeling, finds character modeling vertices around proxy modeling, applies weighting, and smoothes joints and joints with the DeltaMush technique. , In the cage weight method using proxy modeling and deltaMush techniques to extract the values smoothed by the deltaMush technique and apply them to the character skin weight,
Additional work is done to extract weighting values directly from the character whose deformation has been softened with the DeltaMush technique, but by adding the same character applied with the DeltaMush technique, the addition method is the same By copying the character and joint to give the same weight value, by applying Maya's Baker Deformation Deformation to skin Weight from the existing DeltaMush character to the added character. Proxy Modeling, characterized in that the soft weight value is extracted, and the final character is applied to the final character with Maya API's getWeight and setWeight from the character from which the soft weight value is extracted And Cage Weight Method Using DeltaMush Technique delete delete

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