/**
* Configure the light source used for shadow mapping
*
* @param lightNodeInstance The node containing the light instance
* @param lightIndex The index of the light in light instances of the node
*/
public void setLight(final Node lightNodeInstance, final int lightIndex) {
// android.util.Log.d(TAG,"setLight("+lightNodeInstance.id+","+lightIndex+")");
this.lightType = lightNodeInstance.lightInstances[lightIndex].type;
switch (this.lightType) {
case Light.DIRECTIONAL:
this.lightModel[8] = this.lightModel[8] = this.lightModel[9] = this.lightModel[11] = 0f;
this.lightModel[10] = -1f;
MatrixUtils.multiplyMV(this.lightModel, 8, lightNodeInstance.model, 0, this.lightModel, 8);
this.lightModel[0] = this.lightModel[1] = this.lightModel[2] = 0f;
this.lightModel[3] = 1f;
MatrixUtils.multiplyMV(this.lightModel, 0, lightNodeInstance.model, 0, this.lightModel, 0);
final float length =
Matrix.length(this.lightModel[0], this.lightModel[1], this.lightModel[2]);
this.lightModel[8] *= length;
this.lightModel[9] *= length;
this.lightModel[10] *= length;
break;
case Light.POINT:
this.lightModel[0] = this.lightModel[1] = this.lightModel[2] = 0f;
this.lightModel[3] = 1f;
MatrixUtils.multiplyMV(this.lightModel, 0, lightNodeInstance.model, 0, this.lightModel, 0);
break;
case Light.SPOT:
this.lightModel[0] = this.lightModel[1] = this.lightModel[2] = 0f;
this.lightModel[3] = 1f;
MatrixUtils.multiplyMV(this.lightModel, 0, lightNodeInstance.model, 0, this.lightModel, 0);
this.lightModel[8] = this.lightModel[8] = this.lightModel[9] = this.lightModel[11] = 0f;
this.lightModel[10] = -1f;
MatrixUtils.multiplyMV(this.lightModel, 8, lightNodeInstance.model, 0, this.lightModel, 8);
this.lightModel[4] = this.lightModel[0] + this.lightModel[8];
this.lightModel[5] = this.lightModel[1] + this.lightModel[9];
this.lightModel[6] = this.lightModel[2] + this.lightModel[10];
this.lightModel[7] = 1f;
break;
}
}
/**
* Define a viewing transformation in terms of an eye point, a center of view, and an
* mLocalTranslation vector.
*
* @param eyex eye x coordinate
* @param eyey eye y coordinate
* @param eyez eye z coordinate
* @param centerx view center x coordinate
* @param centery view center y coordinate
* @param centerz view center z coordinate
* @param mLocalTranslationx mLocalTranslation vector x coordinate
* @param mLocalTranslationy mLocalTranslation vector y coordinate
* @param mLocalTranslationz mLocalTranslation vector z coordinate
*/
public void lookAt(
float eyex,
float eyey,
float eyez,
float centerx,
float centery,
float centerz,
float mLocalTranslationx,
float mLocalTranslationy,
float mLocalTranslationz) {
float[] x = new float[3];
float[] y = new float[3];
float[] z = new float[3];
float mag;
// Make rotation matrix
// Z vector
z[0] = eyex - centerx;
z[1] = eyey - centery;
z[2] = eyez - centerz;
mag = Matrix.length(z[0], z[1], z[2]);
if (mag > 0) { // mpichler, 19950515
mag = 1 / mag;
z[0] *= mag;
z[1] *= mag;
z[2] *= mag;
}
// Y vector
y[0] = mLocalTranslationx;
y[1] = mLocalTranslationy;
y[2] = mLocalTranslationz;
// X vector = Y cross Z
x[0] = y[1] * z[2] - y[2] * z[1];
x[1] = -y[0] * z[2] + y[2] * z[0];
x[2] = y[0] * z[1] - y[1] * z[0];
// Recompute Y = Z cross X
y[0] = z[1] * x[2] - z[2] * x[1];
y[1] = -z[0] * x[2] + z[2] * x[0];
y[2] = z[0] * x[1] - z[1] * x[0];
// mpichler, 19950515
// cross product gives area of parallelogram, which is < 1.0 for
// non-perpendicular unit-length vectors; so normalize x, y here
mag = Matrix.length(x[0], x[1], x[2]);
if (mag > 0) {
mag = 1 / mag;
x[0] *= mag;
x[1] *= mag;
x[2] *= mag;
}
mag = Matrix.length(y[0], y[1], y[2]);
if (mag > 0) {
mag = 1 / mag;
y[0] *= mag;
y[1] *= mag;
y[2] *= mag;
}
synchronized (mViewMatrix) {
mViewMatrix[0] = x[0];
mViewMatrix[4] = x[1];
mViewMatrix[8] = x[2];
mViewMatrix[12] = 0.0f;
mViewMatrix[1] = y[0];
mViewMatrix[5] = y[1];
mViewMatrix[9] = y[2];
mViewMatrix[13] = 0.0f;
mViewMatrix[2] = z[0];
mViewMatrix[6] = z[1];
mViewMatrix[10] = z[2];
mViewMatrix[14] = 0.0f;
mViewMatrix[3] = 0.0f;
mViewMatrix[7] = 0.0f;
mViewMatrix[11] = 0.0f;
mViewMatrix[15] = 1.0f;
// Matrix.multiplyMM(model, 0, m, 0, model, 0);
// Translate Eye to Origin
mPosition[0] = eyex;
mPosition[1] = eyey;
mPosition[2] = eyez;
Matrix.translateM(mViewMatrix, 0, -mPosition[0], -mPosition[1], -mPosition[2]);
}
}
