CN104572088A - Simulation method for 3D (three-dimensional) rope - Google Patents

Abstract

The invention discloses a simulation method for a 3D (three-dimensional) rope. The simulation method comprises the following steps: (a) initializing the 3D rope; (b) performing rope attribute configuration, and performing configuration adjustment on attributes of the rope, wherein the configuration adjustment comprises hanging part loading or unloading; (c) generating all nodes after the rope attribute configuration is ended; initializing a network, and then, updating the network wherein the step of initializing the network comprises the flows of initializing a rope node renderer so as to load a resource file; (d) then, start updating the physical attribute variable of the 3D rope, wherein the step of updating the physical attribute variable of the 3D rope concretely comprises the flows of adding rigid body attribute for each node of the rope, adding a configurable joint for each node, and adding a capsule collider for each node. According to the simulation method disclosed by the invention, the integral shape of the rope is controlled by applying the Catmull-Rom Splines curve and the Bezier curve, and moreover, the extension change of the rope is realized by controlling the length of each node and the number of the nodes, and therefore the number of triangles is reduced.

Description

A kind of emulation mode of 3D rope

Technical field

The present invention relates to a kind of software application technology field, specifically, the present invention designs a kind of emulation mode being applied to the 3D rope of mobile phone games.

Background technology

3D rope emulation brief introduction

Be mainly used in the middle of mechanics and 3D game.Wherein the emulation of 3D rope independently uses codes implement with by game developer at first, after serve developer and will write the packing of comparatively perfect code and sell, be published on internet with the form of resource plug.

The brief introduction of Unity3D development of games engine

Unity3D is development of games instrument the most popular at present, and it is the professional game engine developed by UnityTechnoogies company.Its feature is that development efficiency is high, cross-platform and support multiple fine arts resource file form.At present this product in the occupation rate of iPhone Game Market up to more than 50%.

The major product of the rope of 3D emulation in the market has the Quick Ropes of Reverie Interactive company and the Ultimaterope etc. of Ultimate Game Tools company.

Existing rope 3D emulation technology also exists a lot of shortcoming:

The gore number being used for simulating 3D rope is many, larger to the pressure ratio of CPU.This problem is more obvious for mobile phone games.Mobile phone 3D game only can support about 10,000 leg-of-mutton geometric modeling, and rope often needs the triangle of more than 1,000, the smooth running quality that serious leather-silhouette show is played.

The elastically-deformable total figure modelling of rope is strange.The data structure of most emulation rope is all by joint connection by some rope sections independent of each other.Because a large amount of joints does not restrict each other, total figure modelling of rope lacks planning, visually seems very strange.

Summary of the invention

The object of the present invention is to provide a kind of emulation mode of 3D rope, solve the problem that the gore number being used for simulating 3D rope in the middle of current phone game is many, total figure modelling of rope lacks planning, visually seems very strange.

Technical scheme provided by the invention is: a kind of method of 3D rope emulation, comprises the following steps:

A) initialization of 3D rope, comprises the following steps

Step 1), before start node and after end node unit length be 1 place add the summit of respectively, then SPL Catmull-Rom Splines formula is adopted, the node of the start node before rope initialization and the N number of unit length of insertion level and smooth between two summits of end node;

Step 2), the moulded control of rope, is divided into some sub-ropes by entire rope, then take segmentation to adjust; Rope segmentation adopts the flex point identification of curvature, once the curvature generation significant change of rope, then gets one of them flex point as waypoint; On the whole, sub-rope presents Catmull-Rom Splines curvilinear characteristic;

Step 3), every section of rope takes B é zier curve curve to carry out moulding adjustment;

Step 4), the number of triangles abbreviation of rope 3D moulding; Carry out Curvature varying assessment to whole piece rope, some sections that Curvature varying is little are carried out rope merging, thus realize number of triangles abbreviation;

B) rope attribute configuration, is configured adjustment to the attribute of rope, comprises and loads suspension member or unloading suspension member;

C) after rope attribute configuration, namely generate all nodes, carry out initialization network, initialization network comprises initialization rope node renderer and carries out loading resource file, then upgrades grid;

D) then, start the physical attribute variable upgrading 3D rope, each node specifically comprised for rope increases rigid body attribute, and adds configurable joint for each node, for each node adds capsule impinger.

The invention has the beneficial effects as follows:

The present invention uses Catmull-Rom Splines curve and B é zier curve curve to control the moulded of rope, and realizes the telescopic variation of rope by the length of Controlling vertex and quantity, thus abbreviation number of triangles.

Accompanying drawing explanation

When considered in conjunction with the accompanying drawings, by referring to detailed description below, more completely can understand the present invention better and easily learn wherein many adjoint advantages, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention, wherein:

Fig. 1 is logic flow schematic diagram of the present invention;

Fig. 2 is rope flex point identification schematic diagram of the present invention;

Fig. 3 is rope moulding of the present invention adjustment schematic diagram.

Embodiment

For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.

With reference to figure 1, as shown in Figure 1, the method for a kind of 3D rope emulation of the present invention, comprises the following steps:

A) initialization of 3D rope, comprises the following steps, with reference to figure 2;

Step 1), before start node and after end node unit length be 1 place add the summit of respectively, then SPL Catmull-Rom Splines formula is adopted, the node of the start node before rope initialization and the N number of unit length of insertion level and smooth between two summits of end node;

Step 2), the moulded control of rope, is divided into some sub-ropes by entire rope, then take segmentation to adjust; Rope segmentation adopts the flex point identification of curvature, once the curvature generation significant change of rope, then gets one of them flex point as waypoint; On the whole, sub-rope presents Catmull-Rom Splines curvilinear characteristic;

Step 3), every section of rope takes B é zier curve curve to carry out moulding adjustment;

Step 4), the number of triangles abbreviation of rope 3D moulding; Carry out Curvature varying assessment to whole piece rope, some sections that Curvature varying is little are carried out rope merging, thus realize number of triangles abbreviation; (as shown in Fig. 3)

B) rope attribute configuration, is configured adjustment to the attribute of rope, comprises and loads suspension member or unloading suspension member;

C) after rope attribute configuration, namely generate all nodes, carry out initialization network, initialization network comprises initialization rope node renderer and carries out loading resource file, then upgrades grid;

D) then, start the physical attribute variable upgrading 3D rope, each node specifically comprised for rope increases rigid body attribute, and adds configurable joint for each node, for each node adds capsule impinger.

The explanation of above example just understands core concept of the present invention for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (1)

1. a method for 3D rope emulation, is characterized in that, comprise the following steps:

A) initialization of 3D rope, comprises the following steps:

Step 1), before start node and after end node unit length be 1 place add the summit of respectively, then SPL Catmull-Rom Splines formula is adopted, the node of the start node before rope initialization and the N number of unit length of insertion level and smooth between two summits of end node;

Step 2), the moulded control of rope, is divided into some sub-ropes by entire rope, then take segmentation to adjust; Rope segmentation adopts the flex point identification of curvature, once the curvature generation significant change of rope, then gets one of them flex point as waypoint; On the whole, sub-rope presents Catmull-Rom Splines curvilinear characteristic;

Step 3), every section of rope takes B é zier curve curve to carry out moulding adjustment;

Step 4), the number of triangles abbreviation of rope 3D moulding; Carry out Curvature varying assessment to whole piece rope, some sections that Curvature varying is little are carried out rope merging, thus realize number of triangles abbreviation;

B) rope attribute configuration, is configured adjustment to the attribute of rope, comprises and loads suspension member or unloading suspension member;

C) after rope attribute configuration, namely generate all nodes, carry out initialization network, initialization network comprises initialization rope node renderer and carries out loading resource file, then upgrades grid;

D) then, start the physical attribute variable upgrading 3D rope, each node specifically comprised for rope increases rigid body attribute, and adds configurable joint for each node, for each node adds capsule impinger.