CN104851128A - Format conversion method for 3DS model file loading through OSG three-dimensional engine - Google Patents
Format conversion method for 3DS model file loading through OSG three-dimensional engine Download PDFInfo
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Abstract
The invention discloses a format conversion method for 3DS model file loading through an OSG three-dimensional engine. The method comprises the following steps that structure information of a three-dimensional model is read; a three-dimensional model grid information data link table is generated by grid information of the 3DS three-dimensional model, and then a base structure of the OSG three-dimensional engine is generated through OSG three-dimensional engine reading; the effect of the three-dimensional model is read; and a material reading queue and an illumination information array are generated through material and illumination information of the 3DS three-dimensional model, then the base structure of the OSG three-dimensional engine is generated via conversion through OSG three-dimensional engine reading, illumination is enhanced and material information is adaptively modified according to the requirements, and finally an illumination model is rendered and loaded again through the OSG three-dimensional engine and the effect of the three-dimensional model is recovered. Problems of the current generally applied 3DS model file loading method adopting the OSG three-dimensional engine that the loaded model is incomplete and the rendering effect is lost are solved by the method.
Description
Technical field
The present invention relates to the format conversion method that a kind of OSG d engine loads 3DS model file, belong to three-dimensional visualization technique field.
Background technology
Three-dimensional model is the important component part in three-dimensional artificial demo system software.Generally adopt at present first utilized by modeling object 3DS modeling software to generate can the 3DS model file of descriptive modelling object detail feature, then 3DS model file is imported the three-dimensional model loading method in three-dimensional artificial demo system through format conversion.Because in 3DS modeling software and three-dimensional artificial demo system, OpenSceneGraph (OSG) d engine there are differences in the data structure of three-dimensional model, therefore the three-dimensional model partial data structure compared with former three-dimensional model after this kind of three-dimensional model loading method exists importing in actual application is lost, and occurs the problems such as the decline of three-dimensional model display precision, texture mapping and lighting effect disorder.Load the problem of 3DS model file distortion to solve OSG d engine, the research carrying out the format conversion method of OSG d engine loading 3DS model file is very important.
The format conversion method that existing OSG d engine loads 3DS model file mainly contains two kinds, one is that OSG directly reads, this method can complete the loading to 3DS model file, but the information such as 3DS model material, light can not be retained, and the overall distortion of model is serious, cannot directly use as undistorted model.Another kind method is plug-in method, and main flow plug-in unit is OsgExp, and this plug-in unit can almost distortionless loading 3DS model file, and can the material effect that carries of export section 3ds MAX.But the material information that this kind of mode can derive is limited, and lacks dirigibility.
Summary of the invention
The technical matters that the present invention solves is: overcome the deficiencies in the prior art, propose the format conversion method that a kind of OSG d engine loads 3DS model file, under achieving that 3DS model file is undistorted and being loaded into OSG d engine, and can modify to model information according to user's request and strengthen, meet the derivation demand of complicated material to the full extent.
Technical solution of the present invention
OSG d engine loads a format conversion method for 3DS model file, comprises step as follows:
(1) read the structural information of three-dimensional model: by the gridding information of 3DS three-dimensional model, by the storage mode of node tree, generating three-dimensional models gridding information data link table, then read through OSG d engine, generate the foundation structure of OSG d engine; The gridding information of described 3DS three-dimensional model comprises model ID, vertex number, summit value, lines number, curved surface number; Described foundation structure is the geometric model node of OSG, comprises model ID, vertex number, summit value, lines number, curved surface information of number;
(2) effect of three-dimensional model is read: by by the material of 3DS three-dimensional model and Lighting information, by the form of node tree, generate material and read queue and Lighting information array, according to demand illumination is strengthened and adaptability revision is done to material information, 3DS three-dimensional model concave-convex effect, Ambient effect, specular removal fruit are arranged simultaneously, read through OSG d engine again, generate material, illumination and effect node in OSG d engine, finally again played up by OSG d engine again and load Lighting information and effect, for reducing three-dimensional model effect;
(3) according to the rendering order of the three-dimensional model effect in the three-dimensional model foundation structure of step (1) and step (2) and OSG d engine, Reconstruction of three-dimensional model structure.
Reading three-dimensional model structure comprises the following steps:
(1a) the root chunk of 3DS three-dimensional model gridding information and the child node of root chunk is located;
(1b) oriented 3DS three-dimensional model gridding information is read from the storage mode of node tree, and travel through vertex number, summit value, lines number, the curved surface number of the corresponding model of model ID and model ID, model ID and other gridding informations are stored according to the form of each three-dimensional model node, forms three-dimensional model gridding information data chained list;
(1c) reconstructed the inheritance of root chunk nodal information and root chunk and its child node by OSG d engine, redraw 3DS three-dimensional model foundation structure;
(1d) store in the 3DS three-dimensional model structure information write * .osg after OSG d engine being reconstructed, the file of * .ive form.
The effect reading three-dimensional model comprises the following steps:
(2a) the root chunk of 3DS three-dimensional model material information and Lighting information and the child node of root chunk is located;
(2b) by oriented 3DS three-dimensional model material information and the Lighting information storage mode from node tree, read and generate material and read queue and Lighting information array;
(2c) according to user's request, illumination is strengthened to the reflectivity, refractive index and the light intensity that comprise smoothing source primary attribute, and amendment material information comprises the amendment color of texture mapping, chroma-luminance, diffusion, minute surface, glossiness and reflection, 3DS three-dimensional model concave-convex effect, Ambient effect, specular removal fruit are arranged simultaneously;
(2d) the three-dimensional model effect arranged through OSG d engine read step (2c) and material and Lighting information, generate material, illumination and effect node in OSG d engine, and again play up the later root chunk of material information of amendment and the inheritance of child node thereof by OSG d engine, and load the Lighting information after strengthening and effect, for reducing 3DS three-dimensional model effect;
(2e) material information again played up by OSG d engine and Lighting information write in the file of * .osg, * .ive form, and the effect completing overall 3DS three-dimensional model builds.
For the concave-convex effect of 3DS three-dimensional model, Ambient effect, specular removal fruit, cannot be read by 3DS file, by introducing tinter programming in step (2c) user modification process, the concave-convex effect of 3DS three-dimensional model, Ambient effect, specular removal fruit attribute are set, read through OSG d engine and material and Lighting information attribute are set.
The present invention relative to the beneficial effect of prior art is:
(1) the present invention is by reading the gridding information of 3DS three-dimensional model, from the storage mode of node tree, again three-dimensional model gridding information chained list is stored as according to the mode of model node, make each submodel gridding information centralized stores, improve the reading efficiency of OSG d engine, avoid 3DS three-dimensional model gridding loss of learning simultaneously, keep the integrality of 3DS three-dimensional model gridding information to a great extent, avoid directly reading 3DS three-dimensional model information imperfect, the problem of inefficiency.
(2) the present invention is by reading the material information of 3DS three-dimensional model, material information is read queue stored in material, and deconsolidation process is carried out to the material that multilayer pinup picture is formed, pinup picture is stored in three-dimensional model material information chained list with the form of child node, improve the reading efficiency of OSG d engine, and the texture mapping attribute arranged respectively under corresponding OSG d engine, complete concavo-convex, the transparent effect of the material that multilayer pinup picture is formed.Greatly enhance the display effect of 3DS three-dimensional model, solving conventional inserts cannot the limitation of material that forms of multilayer pinup picture everywhere.
(3) the present invention is by providing User Defined to revise material and strengthening the algorithm of illumination, on the basis of reading 3DS three-dimensional model material information and Lighting information, user can by the material properties (color/RGB in amendment 3DS three-dimensional model material information chained list, diffusion, minute surface, reflection, concavo-convex, glossiness), and strengthen illumination attribute in Lighting information array, at fetch phase, material and Lighting information are modified, eliminating conventional inserts can only the limitation of export section material and Lighting information, substantially increase dirigibility of the present invention and versatility.
(4) the present invention increases the method for transformation of three-dimensional model gridding information, the storage mode of model node chain sheet form is converted into from node tree storage mode, be convenient to OSG d engine and load three-dimensional model gridding information, owing to storing with model node form, the gridding information of each submodel is concentrated, and not easily occurs to read infull phenomenon.
(5) the present invention introduces tinter programming at model information fetch phase, supports to arrange the concave-convex effect of 3DS three-dimensional model, Ambient effect, specular removal fruit, improves three-dimensional model display effect.
Accompanying drawing explanation
Fig. 1 is the inventive method process flow diagram;
Fig. 2 is 3DS three-dimensional model basic structure block (chunk) structural drawing of the present invention;
Fig. 3 is that the present invention revises material without User Defined, strengthens the wooden texture map in 3DS basis of illumination;
Fig. 4 is that the present invention revises the golden texture map after material, enhancing illumination through User Defined.
Embodiment
Below in conjunction with accompanying drawing, specific works principle of the present invention is further explained.
In 3DS modeling software and three-dimensional artificial demo system there is certain difference in OSG d engine in the file layout of three-dimensional model, the three-dimensional model set up in 3DS modeling software stores with the form of node tree, the gridding information of each submodel is stored in (comprising model ID, vertex number, summit value, lines number, curved surface number) bottom of node tree with the form of child node, and under being stored in different child nodes respectively, storage organization relatively disperses.And the three-dimensional model in OSG d engine stores with model node form, comprise all gridding informations corresponding to this model (comprising model ID, vertex number, summit value, lines number, curved surface number) under a model node, between each model, the storage of gridding information is relatively independent.
According to the difference of the three-dimensional model information file layout under above-mentioned 3DS three-dimensional model and OSG 3 d rendering engine, in order to reduce 3DS three-dimensional model more truly, more efficiently, the present invention proposes the storage mode that a kind of storage mode by 3DS three-dimensional model node tree form is converted into the three-dimensional model node in OSG d engine.
As shown in Figure 1, it is as follows that the format conversion method that a kind of OSG d engine loads 3DS model file comprises step:
(1) read the structural information of three-dimensional model: by the gridding information of 3DS three-dimensional model, by the storage mode of node tree, generating three-dimensional models gridding information data link table, then read through OSG d engine, generate the foundation structure of OSG d engine; The gridding information of described 3DS three-dimensional model comprises model ID, vertex number, summit value, lines number, curved surface number; Described foundation structure is the geometric model node of OSG, comprises model ID, vertex number, summit value, lines number, curved surface information of number;
Reading three-dimensional model structure comprises the following steps:
(1a) the root chunk of 3DS three-dimensional model gridding information and the child node of root chunk is located; As shown in Figure 2,3DS three-dimensional model file structure is made up of " block (chunk) ", and chunk is mutually nested, and this just determines and must read them in a recursive manner.Three-dimensional model gridding information (comprising model ID, vertex number, summit value, lines number, curved surface number) is located by recursive fashion location chunk-ID.Father and son's inheritance of each block (chunk) that need locate and level progressive relationship, 3DS three-dimensional model block (chunk) tree graph.
(1b) oriented 3DS three-dimensional model gridding information is read from the storage mode of node tree, and travel through vertex number, summit value, lines number, the curved surface number of the corresponding model of model ID and model ID, model ID and other gridding informations are stored according to the form of each three-dimensional model node, form three-dimensional model gridding information data chained list and (under model node, comprise all gridding informations of this model, form is selected according to the demand of user, if this data link table comprise all gridding informations corresponding to each model just can);
(1c) reconstructed the inheritance of root chunk nodal information and root chunk and its child node by the OSG d engine in three-dimensional artificial demo system, redraw 3DS three-dimensional model foundation structure;
(1d) store in the 3DS three-dimensional model structure information write * .osg after OSG d engine being reconstructed, the file of * .ive form.
(2) effect of three-dimensional model is read: by by the material of 3DS three-dimensional model and Lighting information, by the form of node tree, generate material and read queue and Lighting information array, according to demand illumination is strengthened and adaptability revision is done to material information, 3DS three-dimensional model concave-convex effect, Ambient effect, specular removal fruit are arranged simultaneously, read through OSG d engine again, generate material, illumination and effect node in OSG d engine, finally again played up by OSG d engine again and load Lighting information and effect, for reducing three-dimensional model effect;
The effect reading three-dimensional model comprises the following steps:
(2a) the root chunk of 3DS three-dimensional model material information and Lighting information and the child node of root chunk is located;
(2b) by oriented 3DS three-dimensional model material information and the Lighting information storage mode from node tree, read and generate material and read queue and Lighting information array;
(2c) programmed by tinter, arrange the concave-convex effect of 3DS three-dimensional model, environment mappings, specular removal fruit material, concrete facilities is as follows:
Concave-convex effect:
Bump Mapping, by the method for random perturbation surface normal, changes the reflection direction of light, thus generates the sense of reality effect of concavo-convex veining on surface.Texture coordinate and normal vector, light vector, the sight line vector of three-dimensional model is read from 3DS three-dimensional model, be delivered to fragment shader from vertex information, NormalMap (normal pinup picture) attribute is set, by fragment shader, normal vector method of perturbation is carried out to each fragment, offset property control disturbance quantity is set, then disturbance is stored as texture.
Environment mappings effect:
Environment isometric chart texture is set, defines the reflection strength of main texture and alpha channel definition body surface.In isometric chart, locate texture with reflection vector, reach the effect of environment mappings.
Specular removal fruit:
Calculating simple optical photograph, installation surface angle, optic angle and viewing angle add the height light point depending on observer.This bright spot is the real-time convenient analog to the fuzzy reflection of light source.The fuzzy hierarchy of bright spot is by arranging reflective (Shininess) property control.
(2d) read through OSG d engine and material and Lighting information attribute are set, generating the foundation structure of OSG d engine;
(2e) by the later root chunk of material information of amendment and the inheritance of child node thereof in the OSG d engine in three-dimensional artificial demo system again rendering step (2c), and load the illumination model after strengthening, reduction 3DS three-dimensional model effect;
(2f) material information again played up by OSG d engine and Lighting information write in the file of * .osg, * .ive form, and the effect completing overall 3DS three-dimensional model builds.
(3) according to the rendering order of the three-dimensional model effect in the three-dimensional model foundation structure of step (1) and step (2) and OSG d engine, Reconstruction of three-dimensional model structure.
Embodiment
The format conversion method of 3DS model file is loaded by a kind of OSG d engine provided by the invention, material and Lighting information are revised/strengthened to User Defined, realizes the conversion of the golden material (as shown in Figure 4) arranged to User Defined from the 3DS wooden material in basis (as shown in Figure 3).
Material shown in Fig. 3 is the wooden material in 3DS basis without User Defined amendment/enhancing, and scene own does not comprise light source, and 3DS three-dimensional model corner angle fuzzy, overall scenario is more dim.
Material shown in shown in Fig. 4 is the enhancing material after User Defined strengthens/revises, the primary attribute such as color/RGB, diffusion, minute surface, reflection, glossiness that User Defined arranges material is golden material, and adding environment light source, the effect of visualization of 3DS three-dimensional model has had significant raising.
The undocumented part of the present invention belongs to general knowledge known in this field.
Claims (4)
1. OSG d engine loads a format conversion method for 3DS model file, it is characterized in that comprising step as follows:
(1) read the structural information of three-dimensional model: by the gridding information of 3DS three-dimensional model, by the storage mode of node tree, generating three-dimensional models gridding information data link table, then read through OSG d engine, generate the foundation structure of OSG d engine; The gridding information of described 3DS three-dimensional model comprises model ID, vertex number, summit value, lines number, curved surface number; Described foundation structure is the geometric model node of OSG, comprises model ID, vertex number, summit value, lines number, curved surface information of number;
(2) effect of three-dimensional model is read: by by the material of 3DS three-dimensional model and Lighting information, by the form of node tree, generate material and read queue and Lighting information array, according to demand illumination is strengthened and adaptability revision is done to material information, 3DS three-dimensional model concave-convex effect, Ambient effect, specular removal fruit are arranged simultaneously, read through OSG d engine again, generate material, illumination and effect node in OSG d engine, finally again played up by OSG d engine again and load Lighting information and effect, for reducing three-dimensional model effect;
(3) according to the rendering order of the three-dimensional model effect in the three-dimensional model foundation structure of step (1) and step (2) and OSG d engine, Reconstruction of three-dimensional model structure.
2. a kind of OSG d engine according to claim 1 loads the format conversion method of 3DS model file, it is characterized in that: described reading three-dimensional model structure comprises the following steps:
(1a) the root chunk of 3DS three-dimensional model gridding information and the child node of root chunk is located;
(1b) oriented 3DS three-dimensional model gridding information is read from the storage mode of node tree, and travel through vertex number, summit value, lines number, the curved surface number of the corresponding model of model ID and model ID, model ID and other gridding informations are stored according to the form of each three-dimensional model node, forms three-dimensional model gridding information data chained list;
(1c) reconstructed the inheritance of root chunk nodal information and root chunk and its child node by OSG d engine, redraw 3DS three-dimensional model foundation structure;
(1d) store in the 3DS three-dimensional model structure information write * .osg after OSG d engine being reconstructed, the file of * .ive form.
3. a kind of OSG d engine according to claim 1 loads the format conversion method of 3DS model file, it is characterized in that: the effect of described reading three-dimensional model comprises the following steps:
(2a) the root chunk of 3DS three-dimensional model material information and Lighting information and the child node of root chunk is located;
(2b) by oriented 3DS three-dimensional model material information and the Lighting information storage mode from node tree, read and generate material and read queue and Lighting information array;
(2c) according to user's request, illumination is strengthened to the reflectivity, refractive index and the light intensity that comprise smoothing source primary attribute, and amendment material information comprises the amendment color of texture mapping, chroma-luminance, diffusion, minute surface, glossiness and reflection, 3DS three-dimensional model concave-convex effect, Ambient effect, specular removal fruit are arranged simultaneously;
(2d) the three-dimensional model effect arranged through OSG d engine read step (2c) and material and Lighting information, generate material, illumination and effect node in OSG d engine, and again play up the later root chunk of material information of amendment and the inheritance of child node thereof by OSG d engine, and load the Lighting information after strengthening and effect, for reducing 3DS three-dimensional model effect;
(2e) material information again played up by OSG d engine and Lighting information write in the file of * .osg, * .ive form, and the effect completing overall 3DS three-dimensional model builds.
4. a kind of OSG d engine according to claim 3 loads the format conversion method of 3DS model file, be further characterized in that: for the concave-convex effect of 3DS three-dimensional model, Ambient effect, specular removal fruit, cannot be read by 3DS file, by introducing tinter programming in step (2c) user modification process, the concave-convex effect of 3DS three-dimensional model, Ambient effect, specular removal fruit attribute are set, read through OSG d engine and material and Lighting information attribute are set.
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