course view-dependent. The problem therefore becomes (Free web hosts) one of
course view-dependent. The problem therefore becomes one of sorting geometry from front to back before rendering takes place. For general scenes this is extremely difficult, especially for scenes that are composed of overlapping or interpenetrating objects. Such objects will have to be decomposed into nonpenetrating subsections before rendering. Without sorting, you will only get reasonable results if most of your objects are opaque and you have only a few, nonoverlapping, transparent surfaces. The Java 3D rendering order is as follows: 1. Opaque objects 2. Ordered objects (OrderedGroups) 3. Transparent objects Within the opaque and transparent groups no sorting is performed. Therefore, transparent objects will overlap opaque or ordered objects in front of them, whereas, because transparent objects are not depth-sorted, there are no guarantees that transparent objects will be rendered correctly. Figures 9.19 through 9.29 illustrate some of the potential rendering problems. The scene for the following figures was composed of a single Boxprimitive with one face (LEFT) removed. The LEFTface was replaced with a new, slightly smaller face that included per-vertex colors (COLOR_4). The code used to replace the LEFTface follows: //create a Box with Normal vectors and texture coordinates Box box = new Box(nScale,nScale,nScale, Primitive.GENERATE_NORMALS | Primitive.GENERATE_TEXTURE_COORDS, m_Appearance ); Shape3D frontFace = box.getShape( Box.LEFT ); //create a new left face so we can assign per-vertex colors GeometryArray geometry = new QuadArray( 4, GeometryArray.COORDINATES | GeometryArray.NORMALS | GeometryArray.COLOR_4 | GeometryArray.TEXTURE_COORDINATE_2 ); nScale = 40; //define the geometry for the left face final float[] verts = { -1.0f * nScale, -1.0f * nScale, 1.0f * nScale, -1.0f * nScale, 1.0f * nScale, 1.0f * nScale, -1.0f * nScale, 1.0f * nScale, -1.0f * nScale, -1.0f * nScale, -1.0f * nScale, -1.0f * nScale }; //define the colors for the left face. Note we are using RGBA //colors and include per-vertex transparency final float[] colors = { 1,0,0,0, 0,1,0,0.2f, 0,0,1,0.8f, 0,0,0,1, }; //define the texture coordinates for the left face 142
If you are searching for cheap webhost for your web application, please visit MySQL5 Web Hosting services.