KR20180003108A - Method and apparatus for controlling transparency based on view on 3 dimension rendering device - Google Patents

Abstract

A method and an apparatus for adjusting transparency based on a view on a three-dimensional rendering device are disclosed. The method for adjusting transparency based on a view on a three-dimensional rendering system comprises the steps of: setting a parameter for generating a three-dimensional module; and performing calculation to determine transparency of a line in a three-dimensional rendering module. The parameter is the actual thickness (T) of the line and the minimum transparency (Amin) of the line.

Description

TECHNICAL FIELD The present invention relates to a method and apparatus for adjusting transparency based on a viewpoint in a 3D rendering apparatus,

The present invention relates to a 3D rendering apparatus, and more particularly, to a method and apparatus for adjusting transparency based on a viewpoint in a 3D rendering apparatus.

Unlike movies and animations, which emphasize the image quality of a video itself, the possibility of real-time rendering is considered to be more important than a high-quality video effect in a mobile application program. Low performance mobile devices / consumer devices (computers or tablets) that did not have a GPU (graphics processing unit) in the past could have anti-aliasing, texture mapping, Lighting and so on were executed by using only the ARM CPU. Therefore, it is not possible to render high quality images that can be obtained from a high-performance PC in real time by using the mobile device general user device (computer or tablet), and simple graphics application using text and 2D sprite are mainstream.

With the development of mobile communication technologies and computers, and the introduction of high-performance mobile terminals with GPUs in handheld PCs, personal digital assistants (PDAs), and smartphones, The effects that could not be achieved can be rendered in real time using the GPU. With the advent of such high-performance mobile devices, attention and demand for high quality contents such as high-quality mobile 3D games have increased. In addition, the development of content on consumer devices (computers or tablets) has increased the demand for high quality content such as 3D games.

KR 10-2008-7019913

One aspect of the present invention provides a method of adjusting transparency based on a viewpoint in a 3D rendering apparatus.

Another aspect of the present invention provides an apparatus for performing a method of adjusting transparency based on a viewpoint in a 3D rendering apparatus.

A method for adjusting a viewpoint-based transparency in a 3D rendering system according to an aspect of the present invention includes: setting a parameter for generating a 3D rendering model; and performing an operation for determining a transparency of a line of the 3D rendering model The parameter may be the actual thickness (T) of the line and the minimum transparency (A _min ) of the line.

The transparency may be determined on the basis of the actual distance D _d represented by the pixel at which the line is located, the value obtained by dividing the actual thickness by the actual distance, and the minimum transparency.

Also, the transparency is determined based on the following equation,

≪ Equation &

Where A _min is the minimum transparency of the line, T is the actual thickness of the line, and D _d may be the actual distance represented by the pixel at which the line is located.

Further, D _d is determined based on the following equation,

≪ Equation &

Wherein _{P p} is a pixel at which a line is expressed, N _p is a point at which an eye vector intersects a near plane, F _p is a distance between the eye plane and the near plane, far plane).

According to another aspect of the present invention, there is provided a 3D rendering apparatus for performing a view-based transparency adjustment method, the 3D rendering apparatus including a processor, the processor configured to set a parameter for generating a 3D rendering model, The parameter may be implemented to perform an operation to determine the transparency of the line, wherein the parameter may be the actual thickness of the line T and the minimum transparency of the line A _min .

The transparency may be determined on the basis of the actual distance D _d represented by the pixel at which the line is located, the value obtained by dividing the actual thickness by the actual distance, and the minimum transparency.

Also, the transparency is determined based on the following equation,

≪ Equation &

Where A _min is the minimum transparency of the line, T is the actual thickness of the line, and D _d may be the actual distance represented by the pixel at which the line is located.

Further, D _d is determined based on the following equation,

≪ Equation &

Wherein _{P p} is a pixel at which a line is expressed, N _p is a point at which an eye vector intersects a near plane, F _p is a distance between the eye plane and the near plane, far plane).

According to the method and apparatus for adjusting the transparency based on the viewpoint in the 3D rendering apparatus according to the embodiment of the present invention, when a plurality of lines are represented in a narrow space according to the change of viewpoint in the existing 3D rendering apparatus, So that the visibility of the model can be improved by solving the problem of low visibility of the model.

FIG. 1 is a conceptual diagram illustrating a method of adjusting the thickness of a line in a 3D rendering system according to an embodiment of the present invention.
2 is a conceptual diagram for explaining a parameter used in an embodiment of the present invention.
3 is a flowchart illustrating a method of setting a line transparency according to an embodiment of the present invention.
4 is a conceptual diagram showing a result of adjusting the transparency of a line according to an embodiment of the present invention.
5 is a conceptual diagram illustrating a 3D rendering apparatus capable of adjusting the transparency based on a viewpoint according to an embodiment of the present invention.
6 is a conceptual diagram illustrating a method of setting a minimum transparency of a line according to an embodiment of the present invention.
7 is a conceptual diagram illustrating a method of setting a minimum transparency of a line in consideration of the size of a screen according to an embodiment of the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

A 3D rendering system (or a 3D rendering system) based on an existing OpenGL (graphic library) can display line objects on a screen in units of pixels. Therefore, the line object has one pixel area as a minimum thickness unit.

In this 3D rendering system environment, when a large number of lines are represented in a narrow space according to a change of viewpoint, the lines are aggregated and the visibility of the 3D rendering model (or 3D rendering model) is lowered do. Hereinafter, in order to solve such a problem, a method of improving the visibility by continuously adjusting the transparency of the line according to the movement (enlargement, reduction, etc.) of the viewpoint is disclosed in the embodiment of the present invention. The 3D rendering system according to the embodiment of the present invention can be applied to various user devices (e.g., PC, tablet, mobile terminal, etc.) and is particularly useful for a CAD program or a design application Lt; / RTI >

FIG. 1 is a conceptual diagram illustrating a method of adjusting the thickness of a line in a 3D rendering system according to an embodiment of the present invention.

If a line is rendered using OpenGL, the minimum thickness of the line on the screen can be one pixel. When the surface is expressed on the screen, the size of the model changes naturally depending on the viewpoint. However, when a line is represented on the screen, the line can not be thinly expressed as less than one pixel, the minimum thickness. Therefore, the 3D rendering model can be expressed unnaturally according to the viewpoint.

In the embodiment of the present invention, when the thickness of the line should be thinner than one pixel according to the viewpoint, a three-dimensional rendering model can be created by adjusting the transparency of the line.

A procedure for setting a pre-parameter for generating a three-dimensional rendering model proceeds (step S100).

The preset procedure can set the actual thickness (T) of the line in the world coordinate system and set the minimum transparency (A _Min ) of the line.

An operation procedure for generating a three-dimensional rendering model proceeds (step S110).

The actual distance (D _d ) represented by the pixel at which the line is located in the fragment shader (fragment shader stage) is calculated and the transparency of the line can be determined based on the value of T / D _d and A _min .

Hereinafter, an embodiment of the present invention discloses a technique of adjusting transparency based on a viewpoint for visibility improvement of a line object in a 3D rendering system.

2 is a conceptual diagram for explaining a parameter used in an embodiment of the present invention.

Referring to Figure 2, P (210) is a pixel line that is the expression, E- _p (230) is the location of the point (eye position), the draw-plane (draw plane) is the plane in which the pixels are represented, F _p (200) A point at which an eye vector intersects a far plane and N _p 220 may be a point at which an eye vector intersects a near plane.

The actual distance of one pixel on the near plane is N _d (near plane distance) and the actual distance of one pixel on the far plane may be far plane distance (F _d ).

이고, E_p(230)와 F_p(200) 사이의 거리는

이고, E_p(230)와 N_p(220)사이의 거리는

이다.The distance between E _p (230) and P (210) is

, And the distance between E _p (230) and F _p (200) is

, And the distance between E _p (230) and N _p (220) is

to be.

3 is a flowchart illustrating a method of setting a line transparency according to an embodiment of the present invention.

In Fig. 3, a method for setting the line transparency is disclosed.

Referring to FIG. 3, the distance that one pixel occupies on the plane on the draw plane is determined (step S300).

의 크기가 R이라 하면, 드로우 플레인 상에서 하나의 픽셀이 평면 위에서 차지하는 거리 D_d는 아래의 수학식 1을 기반으로 결정될 수 있다.From here

The distance D _d occupied by one pixel on the plane on the draw plane can be determined based on Equation 1 below.

&Quot; (1) "

The transparency of the line is set (step S310).

If the value of T / D _d is less than 1, it may be natural that the line should be thinner, but it may be represented as 1 pixel.

In this case, the transparency of the line can be set based on the value of T / D _d . If the transparency of the line becomes too small, the line can not be confirmed. Therefore, the transparency of the line may not be set to less than A _Min . Equation (2) below is a formula for determining the transparency of the line.

&Quot; (2) "

Many 3D rendering systems adjust the transparency of the line to solve this problem, but most of the time, since the transparency is controlled stepwise according to the viewpoint, the inconvenience that the 3D rendering object changes suddenly may occur during the conversion of the viewpoint. In addition, since the line thickness also uses the thickness on the screen coordinate system, there is a divergence from the actual shape to be expressed.

In the 3D rendering system according to the embodiment of the present invention, a viewpoint-based transparency adjustment technique for improving the visibility of a line object sets a virtual line thickness in a real world, and a pixel shade (Fragment Shader) Considering the distance in the real world, the transparency of the line can be adjusted continuously in accordance with the movement of the viewpoint.

4 is a conceptual diagram showing a result of adjusting the transparency of a line according to an embodiment of the present invention.

In FIG. 4 (A), the case where the transparency of the outline is not adjusted according to the viewpoint is disclosed.

In FIG. 4B, the case where the transparency of the outline is adjusted according to the viewpoint is disclosed.

Referring to FIGS. 4A and 4B, by adjusting the transparency of the outline along the viewpoint, the accurate shape of the 3D rendering model can be expressed at a long distance.

5 is a conceptual diagram illustrating a 3D rendering apparatus capable of adjusting the transparency based on a viewpoint according to an embodiment of the present invention.

Referring to FIG. 5, the 3D rendering apparatus may include a parameter setting unit 500, a transparency determination unit 510, a 3D rendering unit 520, and a processor 530.

The parameter setting unit 500 may be implemented to set a parameter for generating a 3D rendering model. The parameters for creating the 3D rendering model may be the actual thickness (T) of the line and the minimum transparency (A _min ) of the line.

를 기반으로 결정될 수 있고, D_d는 선이 위치한 픽셀이 표현하는 실제 거리일 수 있다. The transparency determining unit 510 may be implemented to determine the transparency of the line based on the set parameters. Transparency can be determined based on the actual distance D _d represented by the pixel at which the line is located at the time of rendering the line, the value obtained by dividing the actual thickness by the actual distance, and the minimum transparency. The transparency, as described above,

And D _d may be the actual distance represented by the pixel at which the line is located.

를 기반으로 결정되고, E_p는 시점의 위치, P는 선이 표현되는 픽셀, N_p는 눈 벡터(eye vector)가 근거리 플레인(near plane)과 교차하는 지점, F_p는 상기 눈 벡터가 원거리 플레인(far plane)과 교차하는 지점일 수 있다.The actual distance D _d , represented by the pixel at which the line is located,

And the decision is based, E _p is the position of the time, P is the pixel to which lines are expressed, N _p is the intersection with the eye vector (eye vector) the near plane (near plane), F _p is the eye vector is a distance And may intersect the far plane.

The 3D rendering unit 520 may be implemented to perform 3D rendering based on transparency determined by the transparency determination unit.

The processor 530 may be implemented to control the operations of the parameter setting unit 500, the transparency determination unit 510, and the 3D rendering unit 520.

6 is a conceptual diagram illustrating a method of setting a minimum transparency of a line according to an embodiment of the present invention.

FIG. 6 discloses a method of setting a minimum transparency of a line in consideration of a visual characteristic of a user.

Referring to FIG. 6, the 3D rendering system may adaptively set the minimum transparency of the line in consideration of the visual characteristic information 600 of the user. For example, the 3D rendering system may provide various 3D rendering models to the user device to obtain the visual characteristics information 600 of the user. The various 3D rendering models may be models with changes in viewpoint and distance.

The user can receive information on various 3D rendering models and check for a 3D rendering model that feels visually awkward. The 3D rendering system analyzes the characteristic information of the 3D rendering model that the user feels visually awkward and determines the visual characteristic information 600 of the user in consideration of the characteristic information of the 3D rendering model that the user feels visually awkward .

After determining the visual characteristic information 600 of the user, the 3D rendering system can determine the transparency 620 of the line in the 3D rendering model in consideration of the visual characteristic information 600 of the user. Specifically, A _min can be determined according to the visual characteristics of the user. For a user with a sensitive visual characteristic, a relatively lower value of A _Min may be selected, and for a user whose visual characteristics are not sensitive, a relatively higher value of A _Min may be selected.

Based on this method, the user's perception of the 3D rendering model can be maximized.

The visual characteristics information of such users can be collected and used for the generation of a 3D rendering model thereafter. For example, a server managing a 3D rendering system may collect visual characteristics information from these users and select an optimal A _Min by considering the visual characteristics of the user.

7 is a conceptual diagram illustrating a method of setting a minimum transparency of a line in consideration of the size of a screen according to an embodiment of the present invention.

7 is a conceptual diagram illustrating a method of setting a minimum transparency of a line in consideration of the size of a screen.

Referring to FIG. 7, the minimum transparency of lines may be set differently according to the size of a screen provided as a user.

For example, the 3D rendering system may select a different minimum transparency of the line based on the size of the display and resolution information of the display included in the user's device.

For example, the display capability information 700 may be set based on the size of the display of the user and the resolution information of the display, and the minimum transparency 720 of the line may be different depending on the value of the display capability information 700 Can be set.

Specifically, when the value of the display capability information 700 is included in the first range, the minimum transparency 720 of the line is set to the first value, and when the value of the display capability information 700 is included in the second range, If the minimum transparency 720 of the line is set to the second value and the value of the capability information 700 of the display is included in the third range, the minimum transparency 720 of the line may be set to the third value.

Or a linear function defining the relationship between the capability information 700 of the display and the minimum transparency 720 of the line is defined and the minimum transparency 720 of the line may be determined by inputting the capability information of the display into the linear function.

In such a 3D rendering apparatus, the viewpoint-based transparency adjustment method may be implemented in an application or in the form of program instructions that can be executed through various computer components, and recorded in a computer-readable recording medium. The computer-readable recording medium may include program commands, data files, data structures, and the like, alone or in combination.

The program instructions recorded on the computer-readable recording medium may be those specially designed and configured for the present invention and may be those known and used by those skilled in the computer software arts.

Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like.

Examples of program instructions include machine language code such as those generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules for performing the processing according to the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

Claims (8)

In the 3D rendering system,
Setting a parameter for generating a 3D rendering model; And
Performing an operation to determine a transparency of a line of the 3D rendering model,
Characterized in that the parameter is the actual thickness (T) of the line and the minimum transparency (A _min ) of the line. The method according to claim 1,
Wherein the transparency is determined based on an actual distance (D _d ) represented by the pixel at which the line is located at the time of representing the line, a value obtained by dividing the actual thickness by the actual distance, and the minimum transparency. The method according to claim 1,
The transparency is determined based on the following equation,
≪ Equation &

Wherein A _min is the minimum transparency of the line, T is the actual thickness of the line, and D _d is the actual distance represented by the pixel at which the line is located. The method of claim 3,
D _d is determined based on the following equation,
≪ Equation &

Wherein _{P p} is a pixel at which a line is expressed, N _p is a point at which an eye vector intersects a near plane, F _p is a distance between the eye plane and the near plane, far plane). < / RTI > A three-dimensional rendering apparatus for performing a view-based transparency adjustment method,
Wherein the 3D rendering device comprises a processor,
The processor sets a parameter for generating a 3D rendering model,
Dimensional rendering model of the 3D rendering model,
Wherein the parameter is an actual thickness (T) of the line and a minimum transparency (A _min ) of the line. 6. The method of claim 5,
Wherein the transparency is determined on the basis of an actual distance (D _d ) represented by the pixel at which the line is located at the time of representing the line, a value obtained by dividing the actual thickness by the actual distance, and the minimum transparency. Rendering device. 6. The method of claim 5,
The transparency is determined based on the following equation,
≪ Equation &

Wherein A _min is the minimum transparency of the line, T is the actual thickness of the line, and D _d is the actual distance represented by the pixel at which the line is located. 8. The method of claim 7,
D _d is determined based on the following equation,
≪ Equation &

Wherein _{P p} is a pixel at which a line is expressed, N _p is a point at which an eye vector intersects a near plane, F _p is a distance between the eye plane and the near plane, and a far plane intersecting with the far plane.

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