1
我使用的頂點索引來呈現我mesh.I具有通過頂點指數和頂點位置沒有問題。OpenGL ES2：頂點索引和紋理座標？
但我在紋理座標的情況下不知道，我應該讓它們使用他們太指數？
編輯：我想通過和渲染OBJ文件和困惑如何處理紋理「FX/Y/Z」座標描述
例如，在多維數據集的情況下，我通過我的頂點座標：
* 8頂點COORDS
* 36個頂點索引：
當傳遞紋理（或甚至法線）我應該將它們作爲：
* （8個紋理COORDS + 36紋理座標索引）。 如果是這樣，在渲染過程中如何分配它們？
或
* （36紋理座標）？
這是我的抽象類網，
public class AbstractMesh3D {
//private int buffers[]={0,0};
private int vbVertices[]=new int[1];
private int vbIndices[]=new int[1];
private int vbNormals[]=new int[1];
private int vbColors[]=new int[1];
private int vbTextureCords[]=new int[1];
private boolean bVertices=false;
private boolean bIndices=false;
private boolean bNormals=false;
private int numOfVertices;
private int numOfIndices;
private int numOfNormals;
private World3D _world;
private String textureId;
public void setTextureId(String textureId) {
this.textureId = textureId;
}
public AbstractMesh3D(){
}
public void setWorld(World3D world){
this._world=world;
}
public void setVertexBuffer(float vertexData[]){
GLES20.glGenBuffers(1, vbVertices, 0);
//Short
FloatBuffer vertexFloatBuffer=ByteBuffer.allocateDirect(vertexData.length*4).order(ByteOrder.nativeOrder()).asFloatBuffer();
vertexFloatBuffer.put(vertexData);
vertexFloatBuffer.position(0);
//GLES20.glGenBuffers(1, vbVertices, 0);
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, vbVertices[0]);
GLES20.glBufferData(GLES20.GL_ARRAY_BUFFER, vertexData.length*4, vertexFloatBuffer, GLES20.GL_STATIC_DRAW);
numOfVertices=vertexData.length/3;
bVertices=true;
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, 0);
//vertexFloatBuffer.
}
public void setNormalBuffer(float normalData[]){
GLES20.glGenBuffers(1, vbNormals, 0);
//Short
FloatBuffer vertexFloatBuffer=ByteBuffer.allocateDirect(normalData.length*4).order(ByteOrder.nativeOrder()).asFloatBuffer();
vertexFloatBuffer.put(normalData);
vertexFloatBuffer.position(0);
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, vbNormals[0]);
GLES20.glBufferData(GLES20.GL_ARRAY_BUFFER, normalData.length*4, vertexFloatBuffer, GLES20.GL_STATIC_DRAW);
bNormals=true;
numOfNormals=normalData.length/3;
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, 0);
}
public void setIndices(short indices[]){
GLES20.glGenBuffers(1, vbIndices, 0);
ShortBuffer vertexFloatBuffer=ByteBuffer.allocateDirect(indices.length*2).order(ByteOrder.nativeOrder()).asShortBuffer();
vertexFloatBuffer.put(indices);
vertexFloatBuffer.position(0);
//GLES20.glGenBuffers(1, buffers[1], 0);
GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, vbIndices[0]);
GLES20.glBufferData(GLES20.GL_ELEMENT_ARRAY_BUFFER, indices.length*2, vertexFloatBuffer, GLES20.GL_STATIC_DRAW);
numOfIndices=indices.length;
bIndices=true;
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, 0);
}
public void render(){
int posHandle=_world.getOgl_aPositionHandle();
int normalHandle=_world.getOgl_aNormalHandle();
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, vbVertices[0]);
GLES20.glEnableVertexAttribArray(posHandle);
GLES20.glVertexAttribPointer(posHandle, 3, GLES20.GL_FLOAT, false, 12, 0);
if(bNormals){
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, vbNormals[0]);
GLES20.glEnableVertexAttribArray(normalHandle);
GLES20.glVertexAttribPointer(normalHandle, 3, GLES20.GL_FLOAT, false, 12, 0);
}
if(bIndices){
//System.out.println("render indices");
GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, vbIndices[0]);
GLES20.glDrawElements(GLES20.GL_TRIANGLES, numOfIndices, GLES20.GL_UNSIGNED_SHORT, 0);
}else{
GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, numOfVertices);
}
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, 0);
GLES20.glDisableVertexAttribArray(posHandle);
GLES20.glDisableVertexAttribArray(normalHandle);
//System.out.println("rendered");
}
}