private void setGeometryData() {
final FloatBuffer verts = _meshData.getVertexBuffer();
final FloatBuffer norms = _meshData.getNormalBuffer();
final FloatBuffer texs = _meshData.getTextureBuffer(0);
verts.rewind();
norms.rewind();
texs.rewind();
// generate geometry
final double inverseRadial = 1.0 / radialSamples;
final double inverseSphere = 1.0 / sphereSamples;
final double halfHeight = 0.5 * height;
// Generate points on the unit circle to be used in computing the mesh
// points on a cylinder slice.
final double[] sin = new double[radialSamples + 1];
final double[] cos = new double[radialSamples + 1];
for (int radialCount = 0; radialCount < radialSamples; radialCount++) {
final double angle = MathUtils.TWO_PI * inverseRadial * radialCount;
cos[radialCount] = MathUtils.cos(angle);
sin[radialCount] = MathUtils.sin(angle);
}
sin[radialSamples] = sin[0];
cos[radialSamples] = cos[0];
final Vector3 tempA = new Vector3();
// top point.
verts.put(0).put((float) (radius + halfHeight)).put(0);
norms.put(0).put(1).put(0);
texs.put(1).put(1);
// generating the top dome.
for (int i = 0; i < sphereSamples; i++) {
final double center = radius * (1 - (i + 1) * (inverseSphere));
final double lengthFraction = (center + height + radius) / (height + 2 * radius);
// compute radius of slice
final double fSliceRadius = Math.sqrt(Math.abs(radius * radius - center * center));
for (int j = 0; j <= radialSamples; j++) {
final Vector3 kRadial = tempA.set(cos[j], 0, sin[j]);
kRadial.multiplyLocal(fSliceRadius);
verts.put(kRadial.getXf()).put((float) (center + halfHeight)).put(kRadial.getZf());
kRadial.setY(center);
kRadial.normalizeLocal();
norms.put(kRadial.getXf()).put(kRadial.getYf()).put(kRadial.getZf());
final double radialFraction = 1 - (j * inverseRadial); // in [0,1)
texs.put((float) radialFraction).put((float) lengthFraction);
}
}
// generate cylinder... but no need to add points for first and last
// samples as they are already part of domes.
for (int i = 1; i < axisSamples; i++) {
final double center = halfHeight - (i * height / axisSamples);
final double lengthFraction = (center + halfHeight + radius) / (height + 2 * radius);
for (int j = 0; j <= radialSamples; j++) {
final Vector3 kRadial = tempA.set(cos[j], 0, sin[j]);
kRadial.multiplyLocal(radius);
verts.put(kRadial.getXf()).put((float) center).put(kRadial.getZf());
kRadial.normalizeLocal();
norms.put(kRadial.getXf()).put(kRadial.getYf()).put(kRadial.getZf());
final double radialFraction = 1 - (j * inverseRadial); // in [0,1)
texs.put((float) radialFraction).put((float) lengthFraction);
}
}
// generating the bottom dome.
for (int i = 0; i < sphereSamples; i++) {
final double center = i * (radius / sphereSamples);
final double lengthFraction = (radius - center) / (height + 2 * radius);
// compute radius of slice
final double fSliceRadius = Math.sqrt(Math.abs(radius * radius - center * center));
for (int j = 0; j <= radialSamples; j++) {
final Vector3 kRadial = tempA.set(cos[j], 0, sin[j]);
kRadial.multiplyLocal(fSliceRadius);
verts.put(kRadial.getXf()).put((float) (-center - halfHeight)).put(kRadial.getZf());
kRadial.setY(-center);
kRadial.normalizeLocal();
norms.put(kRadial.getXf()).put(kRadial.getYf()).put(kRadial.getZf());
final double radialFraction = 1 - (j * inverseRadial); // in [0,1)
texs.put((float) radialFraction).put((float) lengthFraction);
}
}
// bottom point.
verts.put(0).put((float) (-radius - halfHeight)).put(0);
norms.put(0).put(-1).put(0);
texs.put(0).put(0);
}
private void setGeometryData() {
// generate geometry
final double inverseRadial = 1.0 / _radialSamples;
final double inverseAxisLess = 1.0 / (_closed ? _axisSamples - 3 : _axisSamples - 1);
final double inverseAxisLessTexture = 1.0 / (_axisSamples - 1);
final double halfHeight = 0.5 * _height;
// Generate points on the unit circle to be used in computing the mesh
// points on a cylinder slice.
final double[] sin = new double[_radialSamples + 1];
final double[] cos = new double[_radialSamples + 1];
for (int radialCount = 0; radialCount < _radialSamples; radialCount++) {
final double angle = MathUtils.TWO_PI * inverseRadial * radialCount;
cos[radialCount] = MathUtils.cos(angle);
sin[radialCount] = MathUtils.sin(angle);
}
sin[_radialSamples] = sin[0];
cos[_radialSamples] = cos[0];
// generate the cylinder itself
final Vector3 tempNormal = new Vector3();
for (int axisCount = 0, i = 0; axisCount < _axisSamples; axisCount++) {
double axisFraction;
double axisFractionTexture;
int topBottom = 0;
if (!_closed) {
axisFraction = axisCount * inverseAxisLess; // in [0,1]
axisFractionTexture = axisFraction;
} else {
if (axisCount == 0) {
topBottom = -1; // bottom
axisFraction = 0;
axisFractionTexture = inverseAxisLessTexture;
} else if (axisCount == _axisSamples - 1) {
topBottom = 1; // top
axisFraction = 1;
axisFractionTexture = 1 - inverseAxisLessTexture;
} else {
axisFraction = (axisCount - 1) * inverseAxisLess;
axisFractionTexture = axisCount * inverseAxisLessTexture;
}
}
final double z = -halfHeight + _height * axisFraction;
// compute center of slice
final Vector3 sliceCenter = new Vector3(0, 0, z);
// compute slice vertices with duplication at end point
final int save = i;
for (int radialCount = 0; radialCount < _radialSamples; radialCount++) {
final double radialFraction = radialCount * inverseRadial; // in [0,1)
tempNormal.set(cos[radialCount], sin[radialCount], 0);
if (topBottom == 0) {
if (!_inverted) {
_meshData
.getNormalBuffer()
.put(tempNormal.getXf())
.put(tempNormal.getYf())
.put(tempNormal.getZf());
} else {
_meshData
.getNormalBuffer()
.put(-tempNormal.getXf())
.put(-tempNormal.getYf())
.put(-tempNormal.getZf());
}
} else {
_meshData.getNormalBuffer().put(0).put(0).put(topBottom * (_inverted ? -1 : 1));
}
tempNormal
.multiplyLocal((_radius - _radius2) * axisFraction + _radius2)
.addLocal(sliceCenter);
_meshData
.getVertexBuffer()
.put(tempNormal.getXf())
.put(tempNormal.getYf())
.put(tempNormal.getZf());
_meshData
.getTextureCoords(0)
.getBuffer()
.put((float) (_inverted ? 1 - radialFraction : radialFraction))
.put((float) axisFractionTexture);
i++;
}
BufferUtils.copyInternalVector3(_meshData.getVertexBuffer(), save, i);
BufferUtils.copyInternalVector3(_meshData.getNormalBuffer(), save, i);
_meshData
.getTextureCoords(0)
.getBuffer()
.put((_inverted ? 0.0f : 1.0f))
.put((float) axisFractionTexture);
i++;
}
if (_closed) {
_meshData.getVertexBuffer().put(0).put(0).put((float) -halfHeight); // bottom center
_meshData.getNormalBuffer().put(0).put(0).put(-1 * (_inverted ? -1 : 1));
_meshData.getTextureCoords(0).getBuffer().put(0.5f).put(0);
_meshData.getVertexBuffer().put(0).put(0).put((float) halfHeight); // top center
_meshData.getNormalBuffer().put(0).put(0).put(1 * (_inverted ? -1 : 1));
_meshData.getTextureCoords(0).getBuffer().put(0.5f).put(1);
}
}