/// <summary>
///
/// </summary>
/// <param name="manager"></param>
/// <param name="after_image"></param>
public static void RenderAfterImage(JOBJManager manager, float frame, AfterImageDesc after_image)
{
if (manager.Animation == null)
{
return;
}
// process previous keys
AfterImageKey[] keys = new AfterImageKey[3];
for (int i = 0; i < keys.Length; i++)
{
manager.Frame = frame - i;
manager.UpdateNoRender();
var bone = manager.GetWorldTransform(after_image.Bone);
keys[i] = new AfterImageKey()
{
pos = bone.ExtractTranslation(),
rot = bone.ExtractRotation()
};
}
// calculate point positions
var top = new Vector3(after_image.Top, 0, 0);
var bot = new Vector3(after_image.Bottom, 0, 0);
Vector3[] points_top = new Vector3[keys.Length];
Vector3[] points_bottom = new Vector3[keys.Length];
for (int i = 0; i < keys.Length; i++)
{
points_top[i] = keys[i].Transform(top);
points_bottom[i] = keys[i].Transform(bot);
}
float term1 = 1 / (keys[0].pos - keys[1].pos).Length;
float term2 = 1 / (keys[1].pos - keys[2].pos).Length;
Vector3 tan_bottom =
new Vector3(
CalculateTangent(term1, term2, points_bottom[0].X, points_bottom[1].X, points_bottom[2].X),
CalculateTangent(term1, term2, points_bottom[0].Y, points_bottom[1].Y, points_bottom[2].Y),
CalculateTangent(term1, term2, points_bottom[0].Z, points_bottom[1].Z, points_bottom[2].Z));
Vector3 tan_top =
new Vector3(
CalculateTangent(term1, term2, points_top[0].X, points_top[1].X, points_top[2].X),
CalculateTangent(term1, term2, points_top[0].Y, points_top[1].Y, points_top[2].Y),
CalculateTangent(term1, term2, points_top[0].Z, points_top[1].Z, points_top[2].Z));
// render sword trail
GL.PushAttrib(AttribMask.AllAttribBits);
GL.Disable(EnableCap.CullFace);
GL.Disable(EnableCap.DepthTest);
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
// draw strips interpolated
GL.Begin(PrimitiveType.TriangleStrip);
int slices = 10;
float total_indices = (keys.Length - 1) * slices;
float index = total_indices;
for (int s = 0; s < keys.Length - 1; s++)
{
float length = (keys[s].pos - keys[s + 1].pos).Length;
for (float i = 0; i < length; i += length / slices)
{
float alpha = index / total_indices;
GL.Color4(after_image.Color1.X, after_image.Color1.Y, after_image.Color1.Z, alpha);
GL.Vertex3(Herp(1 / length, i, points_top[s], points_top[s + 1], tan_top));
GL.Color4(after_image.Color2.X, after_image.Color2.Y, after_image.Color2.Z, alpha);
GL.Vertex3(Herp(1 / length, i, points_bottom[s], points_bottom[s + 1], tan_bottom));
index--;
}
tan_bottom *= -1;
tan_top *= -1;
}
/*
* GL.Color3(after_image.Color1);
* GL.Vertex3(keys[0].Transform(top));
* GL.Color3(after_image.Color2);
* GL.Vertex3(keys[0].Transform(bot));
*
* GL.Color3(after_image.Color1);
* GL.Vertex3(keys[1].Transform(top));
* GL.Color3(after_image.Color2);
* GL.Vertex3(keys[1].Transform(bot));
*
* GL.Color3(after_image.Color1);
* GL.Vertex3(keys[2].Transform(top));
* GL.Color3(after_image.Color2);
* GL.Vertex3(keys[2].Transform(bot));
*/
GL.End();
GL.PopAttrib();
}
/// <summary>
///
/// </summary>
/// <param name="manager"></param>
/// <param name="after_image"></param>
public static void RenderAfterImage(JOBJManager manager, float frame, AfterImageDesc after_image)
{
if (manager.Animation == null)
{
return;
}
// process previous keys
AfterImageKey[] keys = new AfterImageKey[3];
for (int i = 0; i < keys.Length; i++)
{
manager.Frame = frame - i;
manager.UpdateNoRender();
var bone = manager.GetWorldTransform(after_image.Bone);
keys[i] = new AfterImageKey()
{
pos = bone.ExtractTranslation(),
rot = bone.ExtractRotation()
};
}
//// render sword trail
GL.PushAttrib(AttribMask.AllAttribBits);
GL.Disable(EnableCap.CullFace);
GL.Disable(EnableCap.DepthTest);
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
// draw strips interpolated
GL.Begin(PrimitiveType.TriangleStrip);
var top = new Vector3(after_image.Top, 0, 0);
var bot = new Vector3(after_image.Bottom, 0, 0);
int slices = 10;
float total_indices = (keys.Length - 1) * slices;
float index = total_indices;
for (int s = 0; s < keys.Length - 1; s++)
{
var key1 = keys[s];
var key2 = keys[s + 1];
float length = (keys[s].pos - keys[s + 1].pos).Length;
for (float i = 0; i < length; i += length / slices)
{
float alpha = index / total_indices;
index--;
float blend = i / length;
// lerp angle
var rot = Quaternion.Slerp(key1.rot, key2.rot, blend);
var pos = Vector3.Lerp(key1.pos, key2.pos, blend);
var mat = Matrix4.CreateFromQuaternion(rot) * Matrix4.CreateTranslation(pos);
var start_top = Vector3.TransformPosition(top, mat);
var start_bot = Vector3.TransformPosition(bot, mat);
GL.Color4(after_image.Color1.X, after_image.Color1.Y, after_image.Color1.Z, alpha);
GL.Vertex3(start_top);
GL.Color4(after_image.Color2.X, after_image.Color2.Y, after_image.Color2.Z, alpha);
GL.Vertex3(start_bot);
}
}
GL.End();
GL.PopAttrib();
}