/// <summary>
/// Creates geometry for river water surface with different start and end Y.
/// </summary>
void TriangulateRiverQuad(Vector3 v1, Vector3 v2, Vector3 v3, Vector3 v4, float y1, float y2, float v, bool reversed, Vector3 indices)
{
v1.y = v2.y = y1;
v3.y = v4.y = y2;
Rivers.AddQuad(v1, v2, v3, v4);
// Add UVs according to river orientation (used in water flow effect in river shader)
if (reversed)
{
Rivers.AddQuadUV(1f, 0f, 0.8f - v, 0.6f - v);
}
else
{
Rivers.AddQuadUV(0f, 1f, v, v + 0.2f);
}
Rivers.AddQuadCellData(indices, weights1, weights2);
}
private void TriangulateRiverQuad(
Vector3 v1, Vector3 v2, Vector3 v3, Vector3 v4,
float y1, float y2, float v,
bool reversed, Vector3 indices)
{
v1.y = v2.y = y1;
v3.y = v4.y = y2;
Rivers.AddQuad(v1, v2, v3, v4);
if (reversed)
{
Rivers.AddQuadUV(1f, 0f, 0.8f - v, 0.6f - v);
}
else
{
Rivers.AddQuadUV(0f, 1f, v, v + 0.2f); // left to right, bottom to top.
}
Rivers.AddQuadCellData(indices, weights1, weights2);
}
private void TriangulateWaterfallInWater(
Vector3 v1, Vector3 v2, Vector3 v3, Vector3 v4,
float y1, float y2, float waterY, Vector3 indices)
{
v1.y = v2.y = y1;
v3.y = v4.y = y2;
v1 = HexMetrics.Perturb(v1);
v2 = HexMetrics.Perturb(v2);
v3 = HexMetrics.Perturb(v3);
v4 = HexMetrics.Perturb(v4);
var t = (waterY - y2) / (y1 - y2);
v3 = Vector3.Lerp(v3, v1, t);
v4 = Vector3.Lerp(v4, v2, t);
Rivers.AddQuadUnperterbed(v1, v2, v3, v4);
Rivers.AddQuadUV(0f, 1f, 0.8f, 1f);
Rivers.AddQuadCellData(indices, weights1, weights2);
}
/// <summary>
/// Create geometry for a river than flows in a waterfall unto the water surface,
/// parameter orientation is aligned with river, looking downstream, left & right start vertex,
/// left and right end vertex, cell start height, cell end height and water (where waterfall ends) height.
/// </summary>
void TriangulateWaterfallInWater(Vector3 v1, Vector3 v2, Vector3 v3, Vector3 v4, float y1, float y2, float waterY, Vector3 indices)
{
v1.y = v2.y = y1;
v3.y = v4.y = y2;
// Perturn vertices before interpolating
// If we didnt do this and did it afterwards when creating the quad then we would loose
// the results we will calculate with our interpolation bellow
v1 = HexMetrics.Perturb(v1);
v2 = HexMetrics.Perturb(v2);
v3 = HexMetrics.Perturb(v3);
v4 = HexMetrics.Perturb(v4);
float t = (waterY - y2) / (y1 - y2); // calculate interpolator
v3 = Vector3.Lerp(v3, v1, t);
v4 = Vector3.Lerp(v4, v2, t);
// Create unperturbed quad, we already perturbed the vertices
Rivers.AddQuadUnperturbed(v1, v2, v3, v4);
Rivers.AddQuadUV(0f, 1f, 0.8f, 1f);
Rivers.AddQuadCellData(indices, weights1, weights2);
}