package com.jme3.scene.plugins.blender.cameras;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.jme3.math.FastMath;
import com.jme3.renderer.Camera;
import com.jme3.scene.CameraNode;
import com.jme3.scene.plugins.blender.AbstractBlenderHelper;
import com.jme3.scene.plugins.blender.BlenderContext;
import com.jme3.scene.plugins.blender.file.BlenderFileException;
import com.jme3.scene.plugins.blender.file.Structure;
/**
* A class that is used to load cameras into the scene.
* @author Marcin Roguski
*/
public class CameraHelper extends AbstractBlenderHelper {
private static final Logger LOGGER = Logger.getLogger(CameraHelper.class.getName());
protected static final int DEFAULT_CAM_WIDTH = 640;
protected static final int DEFAULT_CAM_HEIGHT = 480;
/**
* This constructor parses the given blender version and stores the result. Some functionalities may differ in
* different blender versions.
* @param blenderVersion
* the version read from the blend file
* @param blenderContext
* the blender context
*/
public CameraHelper(String blenderVersion, BlenderContext blenderContext) {
super(blenderVersion, blenderContext);
}
/**
* This method converts the given structure to jme camera.
*
* @param structure
* camera structure
* @return jme camera object
* @throws BlenderFileException
* an exception is thrown when there are problems with the
* blender file
*/
public CameraNode toCamera(Structure structure, BlenderContext blenderContext) throws BlenderFileException {
if (blenderVersion >= 250) {
return this.toCamera250(structure, blenderContext.getSceneStructure());
} else {
return this.toCamera249(structure);
}
}
/**
* This method converts the given structure to jme camera. Should be used form blender 2.5+.
*
* @param structure
* camera structure
* @param sceneStructure
* scene structure
* @return jme camera object
* @throws BlenderFileException
* an exception is thrown when there are problems with the
* blender file
*/
private CameraNode toCamera250(Structure structure, Structure sceneStructure) throws BlenderFileException {
int width = DEFAULT_CAM_WIDTH;
int height = DEFAULT_CAM_HEIGHT;
if (sceneStructure != null) {
Structure renderData = (Structure) sceneStructure.getFieldValue("r");
width = ((Number) renderData.getFieldValue("xsch")).shortValue();
height = ((Number) renderData.getFieldValue("ysch")).shortValue();
}
Camera camera = new Camera(width, height);
int type = ((Number) structure.getFieldValue("type")).intValue();
if (type != 0 && type != 1) {
LOGGER.log(Level.WARNING, "Unknown camera type: {0}. Perspective camera is being used!", type);
type = 0;
}
// type==0 - perspective; type==1 - orthographic; perspective is used as default
camera.setParallelProjection(type == 1);
float aspect = width / (float) height;
float fovY; // Vertical field of view in degrees
float clipsta = ((Number) structure.getFieldValue("clipsta")).floatValue();
float clipend = ((Number) structure.getFieldValue("clipend")).floatValue();
if (type == 0) {
// Convert lens MM to vertical degrees in fovY, see Blender rna_Camera_angle_get()
// Default sensor size prior to 2.60 was 32.
float sensor = 32.0f;
boolean sensorVertical = false;
Number sensorFit = (Number) structure.getFieldValue("sensor_fit");
if (sensorFit != null) {
// If sensor_fit is vert (2), then sensor_y is used
sensorVertical = sensorFit.byteValue() == 2;
String sensorName = "sensor_x";
if (sensorVertical) {
sensorName = "sensor_y";
}
sensor = ((Number) structure.getFieldValue(sensorName)).floatValue();
}
float focalLength = ((Number) structure.getFieldValue("lens")).floatValue();
float fov = 2.0f * FastMath.atan((sensor / 2.0f) / focalLength);
if (sensorVertical) {
fovY = fov * FastMath.RAD_TO_DEG;
} else {
// Convert fov from horizontal to vertical
fovY = 2.0f * FastMath.atan(FastMath.tan(fov / 2.0f) / aspect) * FastMath.RAD_TO_DEG;
}
} else {
// This probably is not correct.
fovY = ((Number) structure.getFieldValue("ortho_scale")).floatValue();
}
camera.setFrustumPerspective(fovY, aspect, clipsta, clipend);
return new CameraNode(null, camera);
}
/**
* This method converts the given structure to jme camera. Should be used form blender 2.49.
*
* @param structure
* camera structure
* @return jme camera object
* @throws BlenderFileException
* an exception is thrown when there are problems with the
* blender file
*/
private CameraNode toCamera249(Structure structure) throws BlenderFileException {
Camera camera = new Camera(DEFAULT_CAM_WIDTH, DEFAULT_CAM_HEIGHT);
int type = ((Number) structure.getFieldValue("type")).intValue();
if (type != 0 && type != 1) {
LOGGER.log(Level.WARNING, "Unknown camera type: {0}. Perspective camera is being used!", type);
type = 0;
}
// type==0 - perspective; type==1 - orthographic; perspective is used as default
camera.setParallelProjection(type == 1);
float aspect = 0;
float clipsta = ((Number) structure.getFieldValue("clipsta")).floatValue();
float clipend = ((Number) structure.getFieldValue("clipend")).floatValue();
if (type == 0) {
aspect = ((Number) structure.getFieldValue("lens")).floatValue();
} else {
aspect = ((Number) structure.getFieldValue("ortho_scale")).floatValue();
}
camera.setFrustumPerspective(aspect, camera.getWidth() / camera.getHeight(), clipsta, clipend);
return new CameraNode(null, camera);
}
}