JPH05159071A - Three-dimentional straight line plotting/processing device - Google Patents
Three-dimentional straight line plotting/processing deviceInfo
- Publication number
- JPH05159071A JPH05159071A JP3323296A JP32329691A JPH05159071A JP H05159071 A JPH05159071 A JP H05159071A JP 3323296 A JP3323296 A JP 3323296A JP 32329691 A JP32329691 A JP 32329691A JP H05159071 A JPH05159071 A JP H05159071A
- Authority
- JP
- Japan
- Prior art keywords
- value
- straight line
- axis direction
- initial value
- increase amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Digital Computer Display Output (AREA)
- Image Generation (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はクリッピング領域を有す
る三次元直線描画処理装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional line drawing processing apparatus having a clipping area.
【０００２】[0002]
【従来の技術】従来、三次元直線描画処理装置におい
て、描画するラインの奥行きを与えるＺ値の初期値とＺ
方向の増加量の加算データは、Ｚ軸方向のクリッピング
領域に関係なく、加算データがＺ方向のクリッピング領
域内にあるかないかを１ピクセルごとに判定して描画／
非描画を判定し、非描画の場合でも、Ｚ値の計算は実行
される。2. Description of the Related Art Conventionally, in a three-dimensional straight line drawing processing apparatus, an initial value of Z and a Z value giving the depth of a line to be drawn
The added data of the increase amount in the direction is drawn / determined for each pixel whether or not the added data is in the Z-direction clipping area, regardless of the clipping area in the Z-axis direction.
The non-drawing is determined, and the Z value is calculated even in the non-drawing.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来の三次元
直線描画処理装置では、描画するラインのＺ値の初期値
がＺ軸方向のクリッピング領域の下限、例えば手前側の
境界面の値より小さく、かつＺ軸方向の増加量が負であ
る場合、または、描画するラインのＺ値の初期値がＺ軸
方向のクリッピング領域の上限、例えば奥側の境界面の
値より大きく、かつＺ軸方向の増加量が正である場合に
は、このラインは明らかに描画されないのにＺ値が加算
される度に、Ｚ軸方向のクリッピング領域内に有るかど
うかを判定し、描画／非描画を判定している。このた
め、判定に時間がかかり、描画が低速になる。In the above-described conventional three-dimensional straight line drawing processing apparatus, the initial value of the Z value of the line to be drawn is smaller than the lower limit of the clipping region in the Z axis direction, for example, the value of the front boundary surface. , And the increase amount in the Z-axis direction is negative, or the initial value of the Z value of the line to be drawn is larger than the upper limit of the clipping region in the Z-axis direction, for example, the value of the boundary surface on the back side, and in the Z-axis direction. If the increase amount of is positive, this line is obviously not drawn, but each time Z value is added, it is determined whether it is within the clipping area in the Z-axis direction, and it is determined whether it is drawn or not drawn. is doing. For this reason, the determination takes time, and the drawing becomes slow.
【０００４】本発明の目的は、クリッピング領域外の無
駄な描画のためのＺ値計算及び描画を防ぎ、三次元直線
描画処理を高速化することができる三次元直線描画処理
装置を提供することにある。It is an object of the present invention to provide a three-dimensional straight line drawing processing device capable of preventing Z value calculation and drawing for useless drawing outside the clipping region and speeding up the three-dimensional straight line drawing processing. is there.
【０００５】[0005]
【課題を解決するための手段】本発明の直線描画処理装
置は、クリッピング領域を有する三次元直線描画処理装
置において、直線描画のための二次元の直線のアドレス
を計算する計算手段と、前記計算されたアドレスにより
描画する直線の奥行きのＺ値の初期値を記憶する初期値
記憶手段と、Ｚ軸方向の増加量を記憶する増加量手段
と、前記記憶されたＺ値の初期値と記憶されたＺ軸方向
の増加量を画素ごとに加算する加算手段と、Ｚ軸方向の
クリッピング領域を記憶する領域記憶手段と、加算され
たＺ値がクリッピング領域内に有るか否かを判断して描
画するかしないかを判定する判定手段と、前記Ｚ軸方向
のクリッピング領域の下限側の境界面の値と、描画する
直線のＺ値の初期値とを比較して前記Ｚ値の初期値が小
さく、かつＺ軸方向の増加量が負ならば、描画のための
Ｚ値の加算を中止する中止手段とを具備することを特徴
とする。A straight line drawing processing apparatus according to the present invention is a three-dimensional straight line drawing processing apparatus having a clipping region, a calculating means for calculating an address of a two-dimensional straight line for drawing a straight line, and the calculation means. The initial value storage means stores the initial value of the Z value of the depth of the straight line drawn by the drawn address, the increase amount means stores the increase amount in the Z-axis direction, and the stored initial value of the Z value is stored. The addition means for adding the increase amount in the Z-axis direction for each pixel, the area storage means for storing the clipping area in the Z-axis direction, and the drawing by judging whether or not the added Z value is in the clipping area The determination means for determining whether to perform or not, the lower limit side boundary surface value of the clipping region in the Z-axis direction, and the initial value of the Z value of the straight line to be drawn are compared to reduce the initial value of the Z value. , And Z-axis direction If the increase is negative, characterized by comprising a stop means to stop the addition of the Z values for rendering.
【０００６】また、本発明の三次元直線描画処理装置
は、クリッピング領域を有する三次元直線描画処理装置
おいて、直線描画のための二次元の直線のアドレスを計
算する計算手段と、前記計算されたアドレスにより描画
する直線の奥行きのＺ値の初期値を記憶する初期値記憶
手段と、Ｚ軸方向の増加量を記憶する増加量記憶手段
と、前記記憶されたＺ値の初期値と記憶されたＺ軸方向
の増加量を画素ごとに加算する加算手段と、Ｚ軸方向の
クリッピング領域を記憶する領域記憶手段と、加算され
たＺ値がクリッピング領域内に有るか否かを判断して描
画するかしないかを判定する判定手段と、前記Ｚ軸方向
のクリッピング領域の上限側の境界面の値と、描画する
直線のＺ値の初期値とを比較して前記Ｚ値の初期値が大
きく、かつＺ軸方向の増加量が正ならば、描画のための
Ｚ値の加算を中止する中止手段とを具備することを特徴
とする。Further, the three-dimensional line drawing processing apparatus of the present invention is, in the three-dimensional line drawing processing apparatus having a clipping region, a calculating means for calculating an address of a two-dimensional line for drawing a line, and the calculation means. The initial value storage means for storing the initial value of the Z value of the depth of the straight line drawn by the address, the increase amount storage means for storing the increase amount in the Z-axis direction, and the stored initial value of the Z value are stored. The addition means for adding the increase amount in the Z-axis direction for each pixel, the area storage means for storing the clipping area in the Z-axis direction, and the drawing by judging whether or not the added Z value is in the clipping area The determination means for determining whether or not to perform it is compared with the upper limit boundary surface value of the clipping region in the Z-axis direction and the initial value of the Z value of the straight line to be drawn, and the initial value of the Z value is increased. , And in the Z-axis direction If pressurized amount is positive, characterized by comprising a stop means to stop the addition of the Z values for rendering.
【０００７】[0007]
【作用】三次元直線描画処理において、Ｚ軸方向のクリ
ッピング領域の枠の値と描画ラインの始点のＺ値とを比
較し、かつＺ方向の増加量の符号を判断して、描画のた
めのＺ値計算を実行するかどうかを決める。In the three-dimensional straight line drawing processing, the value of the frame of the clipping area in the Z-axis direction is compared with the Z value of the starting point of the drawing line, and the sign of the increase amount in the Z direction is judged to perform the drawing. Decide whether to perform Z value calculation.
【０００８】[0008]
【実施例】次に本発明の実施例について図面を参照して
説明する。Embodiments of the present invention will now be described with reference to the drawings.
【０００９】図１は本発明の三次元直線描画処理装置の
一実施例である画像処理システムの構成を示すブロック
図である。FIG. 1 is a block diagram showing the arrangement of an image processing system which is an embodiment of the three-dimensional straight line drawing processing apparatus of the present invention.
【００１０】図１を参照すると、本実施例は、Ｚ値の初
期値Ｚｏ，Ｚ軸方向の増加量Ｚｄ，クリッピング領域の
下限側の境界面の値Ｚｓおよびクリッピング領域の上限
側の境界面の値Ｚｅを出力するグラフィックプロセッサ
１と、ビットマップメモリへの描画を抑制し、陰線陰面
消去を行うディジタルディファレンシャルアナライザー
２と、画素ごとの輝度情報を記憶するフレームバッファ
メモリ３と、描画を行うか否かを判定するクリッピング
制御部４と、Ｚ値の加算を行うＺ値加算部５と、奥行き
を記憶するＺバッファメモリ６とによって構成されてい
る。Referring to FIG. 1, in the present embodiment, the initial value Zo of the Z value, the increase amount Zd in the Z-axis direction, the lower limit boundary surface value Zs of the clipping region and the upper limit boundary surface of the clipping region are set. The graphic processor 1 that outputs the value Ze, the digital differential analyzer 2 that suppresses drawing in the bitmap memory and erases hidden lines and hidden surfaces, the frame buffer memory 3 that stores the luminance information for each pixel, and whether or not drawing is performed. The clipping control unit 4 that determines whether the Z value is added, the Z value adding unit 5 that adds the Z value, and the Z buffer memory 6 that stores the depth.
【００１１】図２はクリッピング制御部４およびＺ値加
算部５の構成例を示す。３次元描画時にグラフィックプ
ロセッサ１から与えられるＺ値に関するデータは、Ｚ軸
方向の増加量ＺｄまたはＺｉと、Ｚ値の初期値Ｚｐまた
はＺｑと、クリッピング領域の手前側の境界面の値Ｚｓ
と、クリッピング領域の奥側の境界面の値Ｚｅとであ
る。前記データはそれぞれロードイネーブル信号ＺＤ，
ＺＯ，ＺＳ，ＺＥで制御されるレジスタ８，９，１０，
１１にロードされる。レジスタ９のデータであるＺ値の
初期値Ｚｏとレジスタ１０のデータであるクリッピング
領域の下限である手前側の境界面の値Ｚｓとを比較器１
２で比較する。レジスタ８のデータであるＺ軸方向の増
加量Ｚｄは、負の数が２の補数で表記されるものとする
と、その最上位ビットデータＤＯによって正か負かが判
断される。FIG. 2 shows a configuration example of the clipping control unit 4 and the Z value addition unit 5. The data regarding the Z value given from the graphic processor 1 at the time of three-dimensional drawing is the increase amount Zd or Zi in the Z axis direction, the initial value Zp or Zq of the Z value, and the value Zs of the boundary surface on the front side of the clipping region.
And the value Ze of the boundary surface on the far side of the clipping region. The data are load enable signals ZD,
Registers 8, 9, 10, controlled by ZO, ZS, ZE
Loaded at 11. The initial value Zo of the Z value which is the data of the register 9 and the value Zs of the front boundary surface which is the lower limit of the clipping region which is the data of the register 10 are compared with each other by the comparator 1.
Compare with 2. Assuming that a negative number is represented by a two's complement, the increase amount Zd in the Z-axis direction, which is the data of the register 8, is determined to be positive or negative by the most significant bit data DO.
【００１２】Ｚ値の初期値ＺｏとＺ方向のクリッピング
領域手前側の境界面の値Ｚｓが比較器１２によって比較
される。Ｚ値の初期値Ｚｏが小さいと判断され、かつＺ
軸方向の増加量Ｚｄが負であると判断されるとき、ナン
ド回路１５により加算器１７のＺ値加算データＺｃをロ
ードするレジスタ１４のロードイネーブル信号はロード
不可となり、Ｚ値計算のループは中止される。The comparator 12 compares the initial value Zo of the Z value with the value Zs of the boundary surface on the front side of the clipping area in the Z direction. It is determined that the initial Z value Zo is small, and Z
When it is determined that the increase amount Zd in the axial direction is negative, the load enable signal of the register 14 for loading the Z value addition data Zc of the adder 17 is disabled by the NAND circuit 15 and the Z value calculation loop is stopped. To be done.
【００１３】また、Ｚ値の初期値ＺｏとＺ軸方向のクリ
ッピング領域の上限である奥側の境界面の値Ｚｅが比較
器１３によって比較される。Ｚ値の初期値Ｚｏが大きい
と判断され、かつＺ軸方向の増加量Ｚｄが正であると判
断されるとき、ナンド回路１６により加算器１７のＺ値
加算データＺｃをロードするレジスタ１４はそのロード
イネーブル信号によって、ロード不可となり、Ｚ値計算
のループは中止される。 図３は請求項１に対応するビ
ットマップディスプレイのイメージ図である。３次元描
画時のＺ値の初期値Ｚｏが、画像描画エリア内における
Ｚ方向のクリッピング領域の手前側の境界面の下限値Ｚ
ｓより小さく、かつＺ軸方向の増加量Ｚｄが負ならば、
この描画ラインは描画されない。このような描画の場
合、Ｚ値の計算を中止する。Further, the comparator 13 compares the initial value Zo of the Z value with the value Ze of the boundary surface on the back side which is the upper limit of the clipping area in the Z-axis direction. When it is determined that the initial value Zo of the Z value is large and the increase amount Zd in the Z axis direction is positive, the NAND circuit 16 loads the Z value addition data Zc of the adder 17 into the register 14. The load enable signal disables loading, and the Z value calculation loop is stopped. FIG. 3 is an image diagram of a bitmap display corresponding to claim 1. The initial value Zo of the Z value at the time of three-dimensional drawing is the lower limit value Z of the boundary surface on the front side of the clipping area in the Z direction in the image drawing area.
smaller than s and the increase Zd in the Z-axis direction is negative,
This drawing line is not drawn. In the case of such drawing, the calculation of the Z value is stopped.
【００１４】図４は請求項２に対応するビットマップデ
ィスプレイのイメージ図である。３次元描画時のＺ値の
初期値ＺｏがＺ方向のクリッピング領域の奥側の境界面
の値Ｚｅより大きく、かつＺ軸方向の増加量Ｚｄが正な
らば、このラインは描画されない。このような場合、Ｚ
値の計算を中止する。FIG. 4 is an image diagram of a bit map display corresponding to the second aspect. If the initial value Zo of the Z value at the time of three-dimensional drawing is larger than the value Ze of the boundary surface on the back side of the clipping region in the Z direction and the increase amount Zd in the Z axis direction is positive, this line is not drawn. In such cases, Z
Stop value calculation.
【００１５】[0015]
【発明の効果】以上説明したように本発明は、３次元図
形描画処理において、描画ラインのＺ値の初期値がＺ軸
方向のクリッピング領域の下限側の境界面の値より小さ
く、かつＺ軸方向の増加量が負であるときと、描画ライ
ンのＺ値の初期値がＺ軸方向のクリッピング領域の境界
面の値より大きく、かつＺ軸方向の増加量が正であると
きは、描画のためのＺ値加算を中止し、描画を中止する
ので、描画を高速化できる。As described above, according to the present invention, in the three-dimensional graphic drawing processing, the initial value of the Z value of the drawing line is smaller than the value of the boundary surface on the lower limit side of the clipping area in the Z axis direction, and the Z axis. When the increase amount in the direction is negative, the initial Z value of the drawing line is larger than the boundary surface value of the clipping region in the Z axis direction, and the increase amount in the Z axis direction is positive, Since the Z value addition is stopped and the drawing is stopped, the drawing can be speeded up.
【図１】本発明の一実施例を示すブロック図。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】クリッピング制御部４およびＺ値加算部５の構
成例を示すブロック図。FIG. 2 is a block diagram showing a configuration example of a clipping control unit 4 and a Z value addition unit 5.
【図３】請求項１に対応するビットマップディスプレイ
のイメージ図。FIG. 3 is an image diagram of a bitmap display corresponding to claim 1.
【図４】請求項２に対応するビットマップディスプレイ
のイメージ図。FIG. 4 is an image diagram of a bitmap display according to claim 2.
１ グラフィックプロセッサ ２ ディジタル ディファレンシャル アナライザー ３ フレームバッファメモリ ４ クリッピング制御部 ５ Ｚ値加算部 ６ Ｚバッファメモリ ８，９，１０，１１，１４ レジスタ １２，１３ 比較器 １５，１６ ナンド回路 １７ 加算器 1 Graphic Processor 2 Digital Differential Analyzer 3 Frame Buffer Memory 4 Clipping Control Unit 5 Z Value Adder 6 Z Buffer Memory 8, 9, 10, 11, 14 Registers 12, 13 Comparator 15, 16 NAND Circuit 17 Adder
Claims (2)
画処理装置において、 直線描画のための二次元の直線
のアドレスを計算する計算手段と、 前記計算されたアドレスにより描画する直線の奥行きの
Ｚ値の初期値を記憶する初期値記憶手段と、 Ｚ軸方向の増加量を記憶する増加量手段と、 前記記憶されたＺ値の初期値と記憶されたＺ軸方向の増
加量を画素ごとに加算する加算手段と、 Ｚ軸方向のクリッピング領域を記憶する領域記憶手段
と、 加算されたＺ値がクリッピング領域内に有るか否かを判
断して描画するかしないかを判定する判定手段と、 前記Ｚ軸方向のクリッピング領域の下限側の境界面の値
と、描画する直線のＺ値の初期値とを比較して前記Ｚ値
の初期値が小さく、かつＺ軸方向の増加量が負ならば、
描画のためのＺ値の加算を中止する中止手段とを具備す
ることを特徴とする三次元直線描画処理装置。1. A three-dimensional straight line drawing processing apparatus having a clipping area, a calculating means for calculating an address of a two-dimensional straight line for drawing a straight line, and a Z value of a depth of a straight line drawn by the calculated address. An initial value storage means for storing an initial value, an increase amount means for storing an increase amount in the Z axis direction, and an initial value of the stored Z value and the stored increase amount in the Z axis direction are added for each pixel. Adder means, area storage means for storing a clipping area in the Z-axis direction, judging means for judging whether or not the added Z value is in the clipping area, and for drawing or not, By comparing the value of the boundary surface on the lower limit side of the clipping region in the axial direction with the initial value of the Z value of the straight line to be drawn, if the initial value of the Z value is small and the increase amount in the Z axis direction is negative,
A three-dimensional straight line drawing processing apparatus comprising: a stopping unit that stops adding Z values for drawing.
画処理装置において、 直線描画のための二次元の直線
のアドレスを計算する計算手段と、 前記計算されたアドレスにより描画する直線の奥行きの
Ｚ値の初期値を記憶する初期値記憶手段と、 Ｚ軸方向の増加量を記憶する増加量記憶手段と、 前記記憶されたＺ値の初期値と記憶されたＺ軸方向の増
加量を画素ごとに加算する加算手段と、 Ｚ軸方向のクリッピング領域を記憶する領域記憶手段
と、 加算されたＺ値がクリッピング領域内に有るか否かを判
断して描画するかしないかを判定する判定手段と、 前記Ｚ軸方向のクリッピング領域の上限側の境界面の値
と、描画する直線のＺ値の初期値とを比較して前記Ｚ値
の初期値が大きく、かつＺ軸方向の増加量が正ならば、
描画のためのＺ値の加算を中止する中止手段とを具備す
ることを特徴とする三次元直線描画処理装置。2. A three-dimensional straight line drawing processing device having a clipping area, a calculating means for calculating an address of a two-dimensional straight line for drawing a straight line, and a Z value of a depth of a straight line drawn by the calculated address. An initial value storage means for storing an initial value, an increase amount storage means for storing an increase amount in the Z-axis direction, and an initial value of the stored Z value and the stored increase amount in the Z-axis direction are added for each pixel. And an area storage means for storing a clipping area in the Z-axis direction, a determination means for determining whether or not the added Z value is within the clipping area, and whether or not drawing is performed, If the value of the boundary surface on the upper limit side of the clipping area in the Z-axis direction is compared with the initial value of the Z value of the straight line to be drawn, and the initial value of the Z value is large, and if the increase amount in the Z-axis direction is positive, ,
A three-dimensional straight line drawing processing apparatus comprising: a stopping unit that stops adding Z values for drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3323296A JPH05159071A (en) | 1991-12-06 | 1991-12-06 | Three-dimentional straight line plotting/processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3323296A JPH05159071A (en) | 1991-12-06 | 1991-12-06 | Three-dimentional straight line plotting/processing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05159071A true JPH05159071A (en) | 1993-06-25 |
Family
ID=18153205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3323296A Pending JPH05159071A (en) | 1991-12-06 | 1991-12-06 | Three-dimentional straight line plotting/processing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05159071A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996017325A1 (en) * | 1994-11-30 | 1996-06-06 | Namco Ltd. | Apparatus and method for image synthesizing |
-
1991
- 1991-12-06 JP JP3323296A patent/JPH05159071A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996017325A1 (en) * | 1994-11-30 | 1996-06-06 | Namco Ltd. | Apparatus and method for image synthesizing |
| GB2301513A (en) * | 1994-11-30 | 1996-12-04 | Namco Ltd | Apparatus and method for image synthesizing |
| GB2301513B (en) * | 1994-11-30 | 1999-03-03 | Namco Ltd | Image Synthesis Apparatus and Image Synthesis Method |
| US6037946A (en) * | 1994-11-30 | 2000-03-14 | Namco Ltd. | Image synthesis apparatus and image synthesis method |
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