/// <summary>
/// 绘制立方体
/// </summary>
public void DrawMesh(Mesh mesh, SoftRenderDrawMode drawMode = SoftRenderDrawMode.Triangles)
{
currentDrawMesh = mesh;
// 坐标/旋转与缩放
angel = (angel + 1) % 720;
Vector3 rotation = new Vector3(angel, angel, angel);
Vector3 scale = new Vector3(1, 1, 1) * 0.5f;
Vector3 worldPosition = new Vector3(0, 0, 0);
// 构建M矩阵
Matrix4x4 modelMatrix = Matrix.GetModelMatrix(worldPosition, rotation, scale);
// 构建V矩阵
Matrix4x4 viewMatrix = camera.GetViewMatrix();
// 构建P矩阵
Matrix4x4 projectionMatrix = camera.GetProjectionMatrix();
// 构建MVP矩阵
//Matrix4x4 MVPMatrix = projectionMatrix * viewMatrix * modelMatrix;
//// 给每个顶点引用一份MVP矩阵
//foreach (int i in mesh.triangles) {
// Vertex v = mesh.vertices[i];
// v.mMatrix = modelMatrix;
// v.vMatrix = viewMatrix;
// v.pMatrix = projectionMatrix;
//}
mesh.mMatrix = modelMatrix;
mesh.vMatrix = viewMatrix;
mesh.pMatrix = projectionMatrix;
DrawElement(mesh, modelMatrix, viewMatrix, projectionMatrix, drawMode);
}
public void DrawMesh(Mesh mesh, Vector3 position, Vector3 scale, Vector3 rotation, SoftRenderDrawMode softRenderDrawMode)
{
// 构建M矩阵
Matrix4x4 modelMatrix = Matrix.GetModelMatrix(position, rotation, scale);
// 构建V矩阵
Matrix4x4 viewMatrix = camera.GetViewMatrix();
// 构建P矩阵
Matrix4x4 projectionMatrix = camera.GetProjectionMatrix();
// 构建MVP矩阵
//Matrix4x4 MVPMatrix = projectionMatrix * viewMatrix * modelMatrix;
// 给每个顶点引用一份MVP矩阵
//foreach (int i in mesh.triangles) {
// Vertex v = mesh.vertices[i];
// v.mMatrix = modelMatrix;
// v.vMatrix = viewMatrix;
// v.pMatrix = projectionMatrix;
//}
mesh.mMatrix = modelMatrix;
mesh.vMatrix = viewMatrix;
mesh.pMatrix = projectionMatrix;
DrawElement(mesh, modelMatrix, viewMatrix, projectionMatrix, softRenderDrawMode);
}
/// <summary>
/// 根据传递的Vertex数组和triangleIndex数组来绘制3D图形
/// triangleIndex表示顶点的顺序，triangleIndex[1] = 1，
/// 表示第二个顶点是Vertex数组的第二个元素
/// 绘制的规则是，
/// 每三个成一个三角形进行绘制
/// </summary>
/// <param name="vertices"></param>
/// <param name="triangle"></param>
/// <param name="mvp"></param>
/// <param name="drawMode">默认为连续三角形绘制</param>
public void DrawElement(Mesh mesh, Matrix4x4 mMatrix, Matrix4x4 vMatrix, Matrix4x4 pMatrix, SoftRenderDrawMode drawMode = SoftRenderDrawMode.Triangles)
{
int[] triangle = mesh.triangles;
Vertex[] vertices = mesh.vertices;
if (triangle.Length % 3 != 0)
{
return;
}
switch (drawMode)
{
case SoftRenderDrawMode.Triangles:
for (int i = 0; i < triangle.Length; i += 3)
{
Vertex v1 = vertices[triangle[i]];
Vertex v2 = vertices[triangle[i + 1]];
Vertex v3 = vertices[triangle[i + 2]];
DrawPrimitive(v1, v2, v3, mMatrix, vMatrix, pMatrix);
}
break;
case SoftRenderDrawMode.Triangles_FUN:
Vertex v_init = vertices[triangle[0]];
for (int i = 1; i + 1 < triangle.Length; i += 2)
{
Vertex v2 = vertices[triangle[i]];
Vertex v3 = vertices[triangle[i + 1]];
DrawPrimitive(v_init, v2, v3, mMatrix, vMatrix, pMatrix);
}
break;
case SoftRenderDrawMode.TRIANGLE_STRIP:
Vertex vfirset = vertices[triangle[0]];
Vertex vsecond = vertices[triangle[1]];
Vertex vthird = vertices[triangle[2]];
DrawPrimitive(vfirset, vsecond, vthird, mMatrix, vMatrix, pMatrix);
for (int i = 3; i < triangle.Length; i++)
{
Vertex v1 = vertices[triangle[i - 2]];
Vertex v2 = vertices[triangle[i - 1]];
Vertex v3 = vertices[triangle[i]];
DrawPrimitive(v1, v2, v3, mMatrix, vMatrix, pMatrix);
}
break;
}
}
