XNA Utils
using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Storage;
namespace XNALib
{
public static class XNAUtils
{
public static BoundingBox TransformBoundingBox(BoundingBox origBox, Matrix matrix)
{
Vector3 origCorner1 = origBox.Min;
Vector3 origCorner2 = origBox.Max;
Vector3 transCorner1 = Vector3.Transform(origCorner1, matrix);
Vector3 transCorner2 = Vector3.Transform(origCorner2, matrix);
return new BoundingBox(transCorner1, transCorner2);
}
public static BoundingSphere TransformBoundingSphere(BoundingSphere originalBoundingSphere, Matrix transformationMatrix)
{
Vector3 trans;
Vector3 scaling;
Quaternion rot;
transformationMatrix.Decompose(out scaling, out rot, out trans);
float maxScale = scaling.X;
if (maxScale < scaling.Y)
maxScale = scaling.Y;
if (maxScale < scaling.Z)
maxScale = scaling.Z;
float transformedSphereRadius = originalBoundingSphere.Radius * maxScale;
Vector3 transformedSphereCenter = Vector3.Transform(originalBoundingSphere.Center, transformationMatrix);
BoundingSphere transformedBoundingSphere = new BoundingSphere(transformedSphereCenter, transformedSphereRadius);
return transformedBoundingSphere;
}
public static Model LoadModelWithBoundingSphere(out Matrix[] modelTransforms, string asset, ContentManager content)
{
Model newModel = content.Load<Model>(asset);
modelTransforms = new Matrix[newModel.Bones.Count];
newModel.CopyAbsoluteBoneTransformsTo(modelTransforms);
BoundingSphere completeBoundingSphere = new BoundingSphere();
foreach (ModelMesh mesh in newModel.Meshes)
{
BoundingSphere origMeshSphere = mesh.BoundingSphere;
BoundingSphere transMeshSphere = XNAUtils.TransformBoundingSphere(origMeshSphere, modelTransforms[mesh.ParentBone.Index]);
completeBoundingSphere = BoundingSphere.CreateMerged(completeBoundingSphere, transMeshSphere);
}
newModel.Tag = completeBoundingSphere;
return newModel;
}
public static Matrix[] AutoScale(Model model, float requestedSize)
{
BoundingSphere bSphere = (BoundingSphere)model.Tag;
float originalSize = bSphere.Radius * 2;
float scalingFactor = requestedSize / originalSize;
model.Root.Transform = model.Root.Transform * Matrix.CreateScale(scalingFactor);
Matrix[] modelTransforms = new Matrix[model.Bones.Count];
model.CopyAbsoluteBoneTransformsTo(modelTransforms);
return modelTransforms;
}
public static void DrawBoundingBox(BoundingBox bBox, GraphicsDevice device, BasicEffect basicEffect, Matrix worldMatrix, Matrix viewMatrix, Matrix projectionMatrix)
{
Vector3 v1 = bBox.Min;
Vector3 v2 = bBox.Max;
VertexPositionColor[] cubeLineVertices = new VertexPositionColor[8];
cubeLineVertices[0] = new VertexPositionColor(v1, Color.White);
cubeLineVertices[1] = new VertexPositionColor(new Vector3(v2.X, v1.Y, v1.Z), Color.Red);
cubeLineVertices[2] = new VertexPositionColor(new Vector3(v2.X, v1.Y, v2.Z), Color.Green);
cubeLineVertices[3] = new VertexPositionColor(new Vector3(v1.X, v1.Y, v2.Z), Color.Blue);
cubeLineVertices[4] = new VertexPositionColor(new Vector3(v1.X, v2.Y, v1.Z), Color.White);
cubeLineVertices[5] = new VertexPositionColor(new Vector3(v2.X, v2.Y, v1.Z), Color.Red);
cubeLineVertices[6] = new VertexPositionColor(v2, Color.Green);
cubeLineVertices[7] = new VertexPositionColor(new Vector3(v1.X, v2.Y, v2.Z), Color.Blue);
short[] cubeLineIndices = { 0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7 };
basicEffect.World = worldMatrix;
basicEffect.View = viewMatrix;
basicEffect.Projection = projectionMatrix;
basicEffect.VertexColorEnabled = true;
device.RenderState.FillMode = FillMode.Solid;
basicEffect.Begin();
foreach (EffectPass pass in basicEffect.CurrentTechnique.Passes)
{
pass.Begin();
device.VertexDeclaration = new VertexDeclaration(device, VertexPositionColor.VertexElements);
device.DrawUserIndexedPrimitives<VertexPositionColor>(PrimitiveType.LineList, cubeLineVertices, 0, 8, cubeLineIndices, 0, 12);
pass.End();
}
basicEffect.End();
}
public static void DrawSphereSpikes(BoundingSphere sphere, GraphicsDevice device, BasicEffect basicEffect, Matrix worldMatrix, Matrix viewMatrix, Matrix projectionMatrix)
{
Vector3 up = sphere.Center + sphere.Radius * Vector3.Up;
Vector3 down = sphere.Center + sphere.Radius * Vector3.Down;
Vector3 right = sphere.Center + sphere.Radius * Vector3.Right;
Vector3 left = sphere.Center + sphere.Radius * Vector3.Left;
Vector3 forward = sphere.Center + sphere.Radius * Vector3.Forward;
Vector3 back = sphere.Center + sphere.Radius * Vector3.Backward;
VertexPositionColor[] sphereLineVertices = new VertexPositionColor[6];
sphereLineVertices[0] = new VertexPositionColor(up, Color.White);
sphereLineVertices[1] = new VertexPositionColor(down, Color.White);
sphereLineVertices[2] = new VertexPositionColor(left, Color.White);
sphereLineVertices[3] = new VertexPositionColor(right, Color.White);
sphereLineVertices[4] = new VertexPositionColor(forward, Color.White);
sphereLineVertices[5] = new VertexPositionColor(back, Color.White);
basicEffect.World = worldMatrix;
basicEffect.View = viewMatrix;
basicEffect.Projection = projectionMatrix;
basicEffect.VertexColorEnabled = true;
basicEffect.Begin();
foreach (EffectPass pass in basicEffect.CurrentTechnique.Passes)
{
pass.Begin();
device.VertexDeclaration = new VertexDeclaration(device, VertexPositionColor.VertexElements);
device.DrawUserPrimitives<VertexPositionColor>(PrimitiveType.LineList, sphereLineVertices, 0, 3);
pass.End();
}
basicEffect.End();
}
public static VertexPositionColor[] VerticesFromVector3List(List<Vector3> pointList, Color color)
{
VertexPositionColor[] vertices = new VertexPositionColor[pointList.Count];
int i = 0;
foreach (Vector3 p in pointList)
vertices[i++] = new VertexPositionColor(p, color);
return vertices;
}
public static BoundingBox CreateBoxFromSphere(BoundingSphere sphere)
{
float radius = sphere.Radius * (float)Math.Sqrt(2.0) / 2.0f;
Vector3 outerPoint = new Vector3(radius, radius, radius);
Vector3 p1 = sphere.Center - outerPoint;
Vector3 p2 = sphere.Center + outerPoint;
return new BoundingBox(p1, p2);
}
public static T[] Reshape2Dto1D<T>(T[,] array2D)
{
int width = array2D.GetLength(0);
int height = array2D.GetLength(1);
T[] array1D = new T[width * height];
int i = 0;
for (int z = 0; z < height; z++)
for (int x = 0; x < width; x++)
array1D[i++] = array2D[x, z];
return array1D;
}
public static T[,] Reshape1Dto2D<T>(T[] vertices, int width, int height)
{
T[,] vertexArray = new T[width, height];
int i = 0;
for (int h = 0; h < height; h++)
for (int w = 0; w < width; w++)
vertexArray[w, h] = vertices[i++];
return vertexArray;
}
public static Ray CreateRayFrom2D(GraphicsDevice graphicsDevice, Vector2 point, Matrix projection, Matrix view, Matrix world)
{
Vector3 rayNear = graphicsDevice.Viewport.Unproject(
new Vector3(point.X, point.Y, 0f),
projection, view, Matrix.Identity);
Vector3 rayFar = graphicsDevice.Viewport.Unproject(
new Vector3(point.X, point.Y, 1f),
projection, view, world);
Vector3 direction = rayFar - rayNear;
direction.Normalize();
//Debug.WriteLine(string.Format("start:{0}, direction:{1}", rayNear, direction));
Ray ray = new Ray(rayNear, direction);
return ray;
}
}
}
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