ほとんどのプリミティブの頂点法線を正しく計算する関数があります。しかし、キューブを扱うことはできないようです。
ディフューズ ライト シェーダを試すと、この結果が得られます (右側も同じです)。
これは法線を計算するための私のコードです:
public virtual void GenerateNormals()
{
for (int i = 0; i < vertices.Length; i++)
vertices[i].Normal = new Vector3(0, 0, 0);
for (int i = 0; i < indices.Length / 3; i++)
{
Vector3 firstvec = vertices[indices[i * 3 + 1]].Position - vertices[indices[i * 3]].Position;
Vector3 secondvec = vertices[indices[i * 3]].Position - vertices[indices[i * 3 + 2]].Position;
Vector3 normal = Vector3.Cross(firstvec, secondvec);
normal.Normalize();
vertices[indices[i * 3]].Normal += normal;
vertices[indices[i * 3 + 1]].Normal += normal;
vertices[indices[i * 3 + 2]].Normal += normal;
}
for (int i = 0; i < vertices.Length; i++)
if (vertices[i].Normal != Vector3.Zero) vertices[i].Normal.Normalize();
}
キューブの頂点は次のように生成されます。
Vector3[] vectors = new Vector3[8];
vectors[0] = new Vector3(-1, 1, -1);
vectors[1] = new Vector3(1, 1, -1);
vectors[2] = new Vector3(-1, 1, 1);
vectors[3] = new Vector3(1, 1, 1);
vectors[4] = new Vector3(-1, -1, -1);
vectors[5] = new Vector3(1, -1, -1);
vectors[6] = new Vector3(-1, -1, 1);
vectors[7] = new Vector3(1, -1, 1);
vertices = new VertexPositionNormalColored[24];
//Top
vertices[0].Position = vectors[0];
vertices[0].Color = TopColor;
vertices[1].Position = vectors[1];
vertices[1].Color = TopColor;
vertices[2].Position = vectors[2];
vertices[2].Color = TopColor;
vertices[3].Position = vectors[3];
vertices[3].Color = TopColor;
//Bottom
vertices[4].Position = vectors[4];
vertices[4].Color = BottomColor;
vertices[5].Position = vectors[5];
vertices[5].Color = BottomColor;
vertices[6].Position = vectors[6];
vertices[6].Color = BottomColor;
vertices[7].Position = vectors[7];
vertices[7].Color = BottomColor;
//Left
vertices[8].Position = vectors[2];
vertices[8].Color = LeftColor;
vertices[9].Position = vectors[0];
vertices[9].Color = LeftColor;
vertices[10].Position = vectors[6];
vertices[10].Color = LeftColor;
vertices[11].Position = vectors[4];
vertices[11].Color = LeftColor;
//Right
vertices[12].Position = vectors[3];
vertices[12].Color = RightColor;
vertices[13].Position = vectors[1];
vertices[13].Color = RightColor;
vertices[14].Position = vectors[7];
vertices[14].Color = RightColor;
vertices[15].Position = vectors[5];
vertices[15].Color = RightColor;
//Back
vertices[16].Position = vectors[0];
vertices[16].Color = BackColor;
vertices[17].Position = vectors[1];
vertices[17].Color = BackColor;
vertices[18].Position = vectors[4];
vertices[18].Color = BackColor;
vertices[19].Position = vectors[5];
vertices[19].Color = BackColor;
//Front
vertices[20].Position = vectors[2];
vertices[20].Color = FrontColor;
vertices[21].Position = vectors[3];
vertices[21].Color = FrontColor;
vertices[22].Position = vectors[6];
vertices[22].Color = FrontColor;
vertices[23].Position = vectors[7];
vertices[23].Color = FrontColor;
そして、そのようなインデックス：
indices = new int[36];
//Top
indices[0] = 0;
indices[1] = 1;
indices[2] = 2;
indices[3] = 2;
indices[4] = 3;
indices[5] = 1;
//Back
indices[6] = 16;
indices[7] = 17;
indices[8] = 18;
indices[9] = 18;
indices[10] = 19;
indices[11] = 17;
//Left
indices[12] = 8;
indices[13] = 9;
indices[14] = 10;
indices[15] = 10;
indices[16] = 11;
indices[17] = 9;
//Front
indices[18] = 20;
indices[19] = 21;
indices[20] = 22;
indices[21] = 22;
indices[22] = 23;
indices[23] = 21;
//Right
indices[24] = 12;
indices[25] = 13;
indices[26] = 14;
indices[27] = 14;
indices[28] = 15;
indices[29] = 13;
//Bottom
indices[30] = 4;
indices[31] = 5;
indices[32] = 6;
indices[33] = 6;
indices[34] = 7;
indices[35] = 5;
専門家が解決策を見つけるのを手伝ってくれることを願っています。前もって感謝します！