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因此，我正在尝试制作第三人称视图控制演示。此演示将显示执行以下操作的能力：第三人称视图控制演示中的错误
1）围绕“播放器”旋转摄像头。
2）根据您推动操纵杆的方向和相机的方向移动播放器。
3）根据玩家角度和相机角度显示billboarded玩家精灵的正确角度。
现在1和2正在工作，但我无法弄清楚显示正确的敌人角度有什么问题。
这是相关的代码，我走到这一步：
private void updateLogic(int delta) {
if (joystick != null) {
joystick.poll();
rjoyAngle += ((joystick.getRXAxisValue()/5));
rjoyAngle = ((rjoyAngle + 360) % 360);
System.out.println("rangle = " + rjoyAngle);
camPos.x = (float) (player.pos.x - (Math.sin(rjoyAngle) * camRadius));
camPos.z = (float) (player.pos.z + (Math.cos(-rjoyAngle) * camRadius));
camYaw = (float) ((Math.toDegrees(((Math.atan2(-(camPos.x - player.pos.x), -(camPos.z - player.pos.z)))))+ 360) % 360);
System.out.println("Cam X: " + camPos.x + " Z: " + camPos.z + " yaw: " + camYaw);
float pyaw = ((player.yaw + 360) % 360);
float eyaw = ((camYaw + 360) % 360);
dirYaw = (pyaw + eyaw) % 360;
if(joystick.getXAxisValue() >= -0.5f && joystick.getXAxisValue() <= 0.5f && joystick.getYAxisValue() >= -0.5f && joystick.getYAxisValue() <= 0.5f){
//deadzone?
}
else{
player.yaw = (float) Math.toDegrees(Math.atan2(joystick.getXAxisValue(), joystick.getYAxisValue()));
pyaw = ((player.yaw + 360) % 360);
eyaw = ((camYaw + 360) % 360);
dirYaw = (pyaw + eyaw) % 360;
Vector3f move = new Vector3f();
move.x -= 3 * (float)Math.sin(Math.toRadians(dirYaw));
move.z -= 3 * (float)Math.cos(Math.toRadians(dirYaw));
Vector3f.add(player.pos, move, player.pos);
}
pyaw = ((player.yaw + 360) % 360);
eyaw = ((camYaw + 360) % 360);
playerViewYaw = (dirYaw + eyaw) % 360;
}
player.update();
}
而平局和getSpriteNumber方法：
private void renderGL() {
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
loadIdentity(); // Reset The View
floorTex.bind();
GL11.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL11.GL_REPEAT);
GL11.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, GL11.GL_REPEAT);
GL11.glBegin(GL11.GL_QUADS); // Start Drawing The Cube
GL11.glColor3f(1.0f, 1.0f, 1.0f); // Set The Color To White
GL11.glTexCoord2f(0,0); GL11.glVertex3f(-fieldSize, -groundDepth, -fieldSize); // Top left Of The Quad (bottom)
GL11.glTexCoord2f(fieldSize/floorTex.getTextureWidth(),0); GL11.glVertex3f(fieldSize, -groundDepth, -fieldSize); // Top right Of The Quad (bottom)
GL11.glTexCoord2f(fieldSize/floorTex.getTextureWidth(),fieldSize/floorTex.getTextureHeight()); GL11.glVertex3f(fieldSize, -groundDepth, fieldSize); // Bottom right Of The Quad (bottom)
GL11.glTexCoord2f(0,fieldSize/floorTex.getTextureHeight()); GL11.glVertex3f(-fieldSize, -groundDepth, fieldSize); // Bottom left Of The Quad (bottom)
GL11.glEnd(); // Done Drawing The Quad
int direction = getSpriteNum(playerViewYaw);
drawBillBoardSprite(playerTex[0][direction],player.pos, 0, 1,1,1, 5, 10);
}
public int getSpriteNum(float direction){
direction = (float) Math.abs(Math.floor((direction + 22.5)/45.0));
// direction = direction * 2;
if (direction == 8) direction = 0;
return (int)direction;
}
这应该是你需要看到的唯一的代码，但我会发布所有这些只是为了安全，我甚至会给你们一个项目的zip。
Dream.java：
import java.nio.FloatBuffer;
import org.lwjgl.BufferUtils;
import org.lwjgl.LWJGLException;
import org.lwjgl.Sys;
import org.lwjgl.input.Controller;
import org.lwjgl.input.Controllers;
import org.lwjgl.input.Keyboard;
import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;
import org.lwjgl.util.glu.GLU;
import org.lwjgl.util.vector.Vector3f;
import org.newdawn.slick.opengl.Texture;
import org.newdawn.slick.opengl.TextureLoader;
import org.newdawn.slick.util.ResourceLoader;
public class Dream {
String windowTitle = "Dream - By William Starkovich";
public boolean closeRequested = false;
Player player;
Vector3f camPos;
float camYaw;
float camRadius;
float rjoyAngle = 0;
Controllers controllers ;
Controller joystick;
Texture playerTex[][];
Texture floorTex;
float dirYaw;
float playerViewYaw;
long lastFrameTime; // used to calculate delta
float fieldSize = 500;
float groundDepth = 5;
public void run() {
createWindow();
getDelta(); // Initialise delta timer
init();
initGL();
while (!closeRequested) {
pollInput(getDelta());
updateLogic(getDelta());
renderGL();
Display.update();
Display.sync(60);
}
cleanup();
}
public void init(){
player = new Player(0,0,0);
camRadius = 25;
camYaw = 0;
camPos = new Vector3f(0,0,-camRadius);
playerTex = new Texture[1][8];
try{
floorTex = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("data/graphics/floor.png"));
for(int i = 0; i < 1; i++){
for(int j = 0; j < 8; j++){
playerTex[i][j] = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("data/graphics/player/enemy"+i+"-"+j+".png"));
}
}
controllers = new Controllers();
Controllers.create();
if (Controllers.getControllerCount() > 0) {
joystick = Controllers.getController(0);
joystick.setXAxisDeadZone(0.7f);
joystick.setYAxisDeadZone(0.7f);
joystick.setRXAxisDeadZone(0.7f);
joystick.setRYAxisDeadZone(0.7f);
System.out.println("Joystick has "+joystick.getButtonCount() +" buttons. Its name is "+joystick.getName());
}
else joystick = null;
}
catch(Exception e){
e.printStackTrace();
}
}
private void initGL() {
/* OpenGL */
int width = Display.getDisplayMode().getWidth();
int height = Display.getDisplayMode().getHeight();
GL11.glViewport(0, 0, width, height); // Reset The Current Viewport
GL11.glMatrixMode(GL11.GL_PROJECTION); // Select The Projection Matrix
GL11.glLoadIdentity(); // Reset The Projection Matrix
GLU.gluPerspective(45.0f, ((float) width/(float) height), 0.1f, 600.0f); // Calculate The Aspect Ratio Of The Window
GL11.glMatrixMode(GL11.GL_MODELVIEW); // Select The Modelview Matrix
GL11.glLoadIdentity(); // Reset The Modelview Matrix
GL11.glShadeModel(GL11.GL_SMOOTH); // Enables Smooth Shading
GL11.glClearColor(0, 0.3f, 0.5f, 1f); // Black Background
GL11.glClearDepth(1.0f); // Depth Buffer Setup
GL11.glEnable(GL11.GL_DEPTH_TEST); // Enables Depth Testing
GL11.glDepthFunc(GL11.GL_LEQUAL); // The Type Of Depth Test To Do
GL11.glHint(GL11.GL_PERSPECTIVE_CORRECTION_HINT, GL11.GL_NICEST); // Really Nice Perspective Calculations
GL11.glEnable(GL11.GL_TEXTURE_2D);
GL11.glEnable(GL11.GL_BLEND);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
GL11.glEnable(GL11.GL_ALPHA_TEST);
GL11.glAlphaFunc(GL11.GL_GREATER, 0.9f);
}
private void updateLogic(int delta) {
if (joystick != null) {
joystick.poll();
rjoyAngle += ((joystick.getRXAxisValue()/5));
rjoyAngle = ((rjoyAngle + 360) % 360);
System.out.println("rangle = " + rjoyAngle);
camPos.x = (float) (player.pos.x - (Math.sin(rjoyAngle) * camRadius));
camPos.z = (float) (player.pos.z + (Math.cos(-rjoyAngle) * camRadius));
camYaw = (float) ((Math.toDegrees(((Math.atan2(-(camPos.x - player.pos.x), -(camPos.z - player.pos.z)))))+ 360) % 360);
System.out.println("Cam X: " + camPos.x + " Z: " + camPos.z + " yaw: " + camYaw);
float pyaw = ((player.yaw + 360) % 360);
float eyaw = ((camYaw + 360) % 360);
dirYaw = (pyaw + eyaw) % 360;
if(joystick.getXAxisValue() >= -0.5f && joystick.getXAxisValue() <= 0.5f && joystick.getYAxisValue() >= -0.5f && joystick.getYAxisValue() <= 0.5f){
//deadzone?
}
else{
player.yaw = (float) Math.toDegrees(Math.atan2(joystick.getXAxisValue(), joystick.getYAxisValue()));
pyaw = ((player.yaw + 360) % 360);
eyaw = ((camYaw + 360) % 360);
dirYaw = (pyaw + eyaw) % 360;
Vector3f move = new Vector3f();
move.x -= 3 * (float)Math.sin(Math.toRadians(dirYaw));
move.z -= 3 * (float)Math.cos(Math.toRadians(dirYaw));
Vector3f.add(player.pos, move, player.pos);
}
pyaw = ((player.yaw + 360) % 360);
eyaw = ((camYaw + 360) % 360);
playerViewYaw = (dirYaw + eyaw) % 360;
}
player.update();
}
private void loadIdentity(){
/* OpenGL */
int width = Display.getDisplayMode().getWidth();
int height = Display.getDisplayMode().getHeight();
GL11.glLoadIdentity(); // Reset The Modelview Matrix
//roatate the yaw around the Y axis
GL11.glRotatef(camYaw, 0.0f, -1.0f, 0.0f);
GL11.glTranslatef(camPos.x, -3, camPos.z);
}
private void renderGL() {
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
loadIdentity(); // Reset The View
floorTex.bind();
GL11.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL11.GL_REPEAT);
GL11.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, GL11.GL_REPEAT);
GL11.glBegin(GL11.GL_QUADS); // Start Drawing The Cube
GL11.glColor3f(1.0f, 1.0f, 1.0f); // Set The Color To White
GL11.glTexCoord2f(0,0); GL11.glVertex3f(-fieldSize, -groundDepth, -fieldSize); // Top left Of The Quad (bottom)
GL11.glTexCoord2f(fieldSize/floorTex.getTextureWidth(),0); GL11.glVertex3f(fieldSize, -groundDepth, -fieldSize); // Top right Of The Quad (bottom)
GL11.glTexCoord2f(fieldSize/floorTex.getTextureWidth(),fieldSize/floorTex.getTextureHeight()); GL11.glVertex3f(fieldSize, -groundDepth, fieldSize); // Bottom right Of The Quad (bottom)
GL11.glTexCoord2f(0,fieldSize/floorTex.getTextureHeight()); GL11.glVertex3f(-fieldSize, -groundDepth, fieldSize); // Bottom left Of The Quad (bottom)
GL11.glEnd(); // Done Drawing The Quad
int direction = getSpriteNum(playerViewYaw);
drawBillBoardSprite(playerTex[0][direction],player.pos, 0, 1,1,1, 5, 10);
}
public int getSpriteNum(float direction){
direction = (float) Math.abs(Math.floor((direction + 22.5)/45.0));
// direction = direction * 2;
if (direction == 8) direction = 0;
return (int)direction;
}
public void drawBillBoardSprite(Texture texture, Vector3f sprPos, float y, float r, float g, float b, float sprWidth, float sprHeight){
// store the current model matrix
GL11.glPushMatrix();
GL11.glColor3f(r,g,b);
GL11.glTranslatef(-sprPos.x, y, -sprPos.z);
// bind to the appropriate texture for this sprite
texture.bind();
FloatBuffer modelview = BufferUtils.createFloatBuffer(16);
// get the current modelview matrix
GL11.glGetFloat(GL11.GL_MODELVIEW_MATRIX, modelview);
// Note that a row in the C convention is a column
// in OpenGL convention (see the red book, pg.106 in version 1.2)
// right vector is [1,0,0] (1st column)
// lookAt vector is [0,0,1] (3d column)
// leave the up vector unchanged (2nd column)
// notice the increment in i in the first cycle (i+=2)
for(int i=0; i<3; i+=2)
for(int j=0; j<3; j++) {
if (i==j)
modelview.put(i*4+j, 1.0f);
else
modelview.put(i*4+j, 0.0f);
}
// set the modelview matrix
GL11.glLoadMatrix(modelview);
// draw a quad textured to match the sprite
GL11.glBegin(GL11.GL_QUADS);
GL11.glTexCoord2f(0,0); GL11.glVertex3f((float) - (sprWidth/2),(float) (sprHeight/2), 0); // Top left Of The Quad (Left)
GL11.glTexCoord2f(texture.getWidth(), 0); GL11.glVertex3f((float) + (sprWidth/2),(float) (sprHeight/2), 0); // Top right Of The Quad (Left)
GL11.glTexCoord2f(texture.getWidth(), texture.getHeight()); GL11.glVertex3f((float) + (sprWidth/2),(float) -(sprHeight/2), 0); // Bottom right Of The Quad (Left)
GL11.glTexCoord2f(0, texture.getHeight()); GL11.glVertex3f((float) - (sprWidth/2),(float) -(sprHeight/2), 0); // Bottom left Of The Quad (Left)
GL11.glEnd();
// restore the model view matrix to prevent contamination
GL11.glPopMatrix();
}
/**
* Poll Input
*/
public void pollInput(float delta) {
if (Keyboard.isKeyDown(Keyboard.KEY_F12)){
closeRequested = true;
}
if (Display.isCloseRequested()) {
closeRequested = true;
}
}
/**
* Calculate how many milliseconds have passed
* since last frame.
*
* @return milliseconds passed since last frame
*/
public int getDelta() {
long time = (Sys.getTime() * 1000)/Sys.getTimerResolution();
int delta = (int) (time - lastFrameTime);
lastFrameTime = time;
return delta;
}
private void createWindow() {
try {
Display.setDisplayMode(new DisplayMode(640, 480));
Display.setFullscreen(true);
Display.setVSyncEnabled(true);
Display.setTitle(windowTitle);
Display.create();
//hide the mouse
Mouse.setGrabbed(true);
} catch (LWJGLException e) {
Sys.alert("Error", "Initialization failed!\n\n" + e.getMessage());
System.exit(0);
}
}
/**
* Destroy and clean up resources
*/
private void cleanup() {
Display.destroy();
}
public static void main(String[] args) {
Dream dream = new Dream();
dream.run();
}
}
Player.java：
import java.util.Vector;
import org.lwjgl.util.vector.Vector3f;
public class Player {
float mouseSensitivity = 0.05f;
float movementSpeed = 0.04f; //move 10 units per second
Vector3f pos;
float yaw = 0;
float pitch = 0;
float maxPitch = 90;
float width = 1;
float height = 1;
int inFieldType = 0;
public Player(float sx, float sz, float sa){
pos = new Vector3f(sx,0,sz);
yaw = sa;
}
public void update(){
}
}
这里是（在Eclipse）演示项目： http://dl.dropbox.com/u/28109593/Dream.zip
我无法弄清楚什么是错误的，也不是非常倾向于通过代码转储来猜测。你期待什么行为？发生了什么呢？ – 2012-01-10 01:30:29
我期待着我可以旋转相机来查看所有8个角色的角度，然后从相机所在的位置，我可以向上推动操纵杆，使他走向相机所面对的方向，并将角色转换为背面相机。现在它可以完成所有这些，除了将精灵旋转到背对着相机。 – CyanPrime 2012-01-10 01:36:09
您是否真的编写过代码来尝试让精灵转身朝向相机？如果是这样，那比你发布的任何其他东西都更有意义。另外你的'Player'类中的'update（）'方法是空的，你期望它做什么？ – Deco 2012-01-10 02:37:26