public Float3 lerpNormal(Float3 currentValue, Float3 newValue)
{
if (currentValue == Float3.zero)
return newValue;
return Float3.lerp(currentValue, newValue, 0.5f).normalize();
}
public Quaternion(float w, Float3 v)
{
this.w = w;
this.x = v.x;
this.y = v.y;
this.z = v.z;
}
public void NoTransformTest()
{
Float3 p = new Float3(1, 3, 7);
Float4x4 M = Float4x4.identity;
Assert.AreEqual(p, M.transformPoint(p));
}
public Vertex(Float3 position)
{
this.position = position;
this.normal = Float3.zero;
this.color = Color.Black;
this.uv = new Float2(0, 0);
}
public Float4(Float3 v, float w)
{
this.x = v.x;
this.y = v.y;
this.z = v.z;
this.w = w;
}
public IVertex(Vertex v)
{
this.position = (Int3)v.position;
this.normal = v.normal;
this.color = v.color;
this.uv = v.uv;
}
public void AddTranslationToExistingMatrixTests()
{
Float3 p = new Float3(0, 0, 1);
Float3 t = new Float3(1, 3, 323);
Float4x4 X = Float4x4.identity;
X.setTranslation(t);
Float4x4 minusX = Float4x4.identity;
minusX.setTranslation(t.getOpposite());
Assert.AreEqual(p + t, X.transformPoint(p));
Assert.AreEqual(p, minusX.transformPoint(X.transformPoint(p)));
}
public void SimpleTranslationTest()
{
Float3 p = new Float3(1, 3, 7);
Float3 t = new Float3(1, 2, 3);
Float4x4 M = new Float4x4(1 , 0 , 0 , 0,
0 , 1 , 0 , 0,
0 , 0 , 1 , 0,
t.x, t.y, t.z, 1);
Float4x4 M2 = Float4x4.getTranslationMatrix(t);
Assert.AreEqual(M, M2);
Assert.AreEqual(p + t, M.transformPoint(p));
Assert.AreEqual(p + t, M2.transformPoint(p));
}
public void SimpleProjectionTest()
{
Float3 p = new Float3(2, 4, 2);
const float n = 3f;
const float f = 100f;
const float b = -10;
const float t = 10;
const float r = 10;
const float l = -10;
Float4x4 Projection = Float4x4.getProjectionMatrix(n, f, t, b, r, l);
Float3 p2 = Projection.transformPoint(new Float3(r, b, n));
Float3 p1 = Projection.transformPoint(p);
Assert.IsTrue(p1.x < 1f);
}
public static Float3x3 getRotationMatrix(Float3 rotation)
{
float xAngle = rotation.x;
float yAngle = rotation.y;
float zAngle = rotation.z;
xAngle *= ((float)Math.PI / 180.0f);
yAngle *= ((float)Math.PI / 180.0f);
zAngle *= ((float)Math.PI / 180.0f);
Float3x3 aboutX = new Float3x3(1, 0, 0,
0, (float)Cos(xAngle), (float)Sin(xAngle),
0, (float)(-Sin(xAngle)), (float)Cos(xAngle));
Float3x3 aboutY = new Float3x3((float)Cos(yAngle), 0, (float)(-Sin(yAngle)),
0, 1, 0,
(float)Sin(yAngle), 0, (float)Cos(yAngle));
return aboutX * aboutY;
}
public Float3 cross(Float3 other)
{
//c = a cross b
//cx = aybz − azby
//cy = azbx − axbz
//cz = axby − aybx
return new Float3(this.y * other.z - this.z * other.y,
this.z * other.x - this.x * other.z,
this.x * other.y - this.y * other.x);
}
public static Float3 lerp(Float3 start, Float3 end, float delta)
{
return start + (end - start) * delta;
}
public void Render(SceneObject sObject, Float3 viewDirection, Float3 lightDirection, bool useProjection = true)
{
Mesh mesh = sObject.mesh;
Color wireFrameColor = Color.LightGreen;
RenderType renderType = sObject.material.renderType;
// Vertex uniforms
// scale matrix
Float3x3 S = Float3x3.identity * sObject.uniformScale;
// rotation matrix
Float3x3 R = Float3x3.getRotationMatrix(sObject.rotation);
Float3x3 CombinedLinear = S * R;
// translation
Float4x4 Tr = Float4x4.identity;
Tr.setTranslation(sObject.localPosition);
// projection
Float4x4 Pr = useProjection ? Float4x4.getProjectionMatrix(10f, 1300f, 1f, 1f) : Float4x4.identity;
// BACK FACE CULLING
if (backFaceCulling)
{
for (int i = mesh.Triangles.Count - 1; i >= 0; i--)
{
Triangle t = mesh.Triangles[i];
Float3 v1 = mesh.Vertices[t[0] - 1].position;
Float3 v2 = mesh.Vertices[t[1] - 1].position;
Float3 v3 = mesh.Vertices[t[2] - 1].position;
Float3 normal = Utils.getTriangleNormalR(v1, v2, v3);
// remove faced back triangles
if (viewDirection.dot(normal) >= 0)
mesh.Triangles.Remove(t);
}
}
// VERTEX SHADER
for (int i = 0; i < mesh.Vertices.Count; i++)
{
Vertex v = mesh.Vertices[i];
// scale
var p = v.position.mul(S);
// rotate
p = p.mul(R);
// translate
p = Tr.transformPoint(p);
// project
if(useProjection)
p = Pr.transformPoint(p);
// TODO: Transforming normals while NON UNIFORM TRANSFORMS
v.normal = v.normal.mul(R);
// TODO: place to center of screen
if(useProjection)
v.position = new Float3(p.x * Defaults.WIDTH + Defaults.WIDTH / 2f, p.y * Defaults.HEIGHT + Defaults.HEIGHT / 2f, p.z);
else
v.position = new Float3(p.x + Defaults.WIDTH / 2f, p.y + Defaults.HEIGHT / 2f, p.z);
}
if((renderType & RenderType.Regular) != 0)
RenderRegular(mesh, sObject.material, lightDirection);
if ((renderType & RenderType.Wireframe) != 0)
RenderWireframe(mesh, wireFrameColor);
if ((renderType & RenderType.Normals) != 0)
DrawVertexNormals(mesh, Color.Red);
}
public float dot(Float3 other)
{
return this.x * other.x + this.y * other.y + this.z * other.z;
}
public void Rasterize(Mesh mesh, Material material, Float3 lightDirection)
{
// set interpolated color
for (int i = 0; i < mesh.Triangles.Count; i++)
{
Triangle t = mesh.Triangles[i];
Vertex v1 = mesh.Vertices[t[0] - 1];
Vertex v2 = mesh.Vertices[t[1] - 1];
Vertex v3 = mesh.Vertices[t[2] - 1];
//v2.normal = v1.normal;
//v3.normal = v1.normal;
int cc1 = (int)(getLamberComponent(v1.normal, lightDirection) * 255);
int cc2 = (int)(getLamberComponent(v2.normal, lightDirection) * 255);
int cc3 = (int)(getLamberComponent(v3.normal, lightDirection) * 255);
v1.color = Color.FromArgb(cc1, cc1, cc1);//.lerpTo(Color.Green, 0.5f);
v2.color = Color.FromArgb(cc2, cc2, cc2);//.lerpTo(Color.Blue, 0.5f);
v3.color = Color.FromArgb(cc3, cc3, cc3);//.lerpTo(Color.Red, 0.5f);
}
for (int i = 0; i < mesh.Triangles.Count; i++)
{
Triangle t = mesh.Triangles[i];
Vertex v1 = mesh.Vertices[t[0] - 1];
Vertex v2 = mesh.Vertices[t[1] - 1];
Vertex v3 = mesh.Vertices[t[2] - 1];
RenderTriangle2(v1, v2, v3, material, lightDirection);
}
}
private void RenderRegular(Mesh mesh, Material material, Float3 lightDirection)
{
rasterizer.Rasterize(mesh, material, lightDirection);
// FRAGMENT SHADER
for (int x = 0; x < Defaults.WIDTH; x++)
for (int y = 0; y < Defaults.HEIGHT; y++)
bitmap.elDrawPoint(x, y, zBuffer[x, y].color);
}
private float getLamberComponent(Float3 normal, Float3 lightDirection)
{
normal = normal.normalize();
lightDirection = lightDirection.normalize();
float lambertComponent = normal.dot(lightDirection.normalize());
lambertComponent = lambertComponent < 0 ? 0 : lambertComponent;
return Utils.Clamp(0, 255, lambertComponent);
}
public float dot(Float3 other)
{
return(this.x * other.x + this.y * other.y + this.z * other.z);
}
public void setTranslation(Float3 t)
{
this._m[3, 0] = t.x;
this._m[3, 1] = t.y;
this._m[3, 2] = t.z;
}
public Float3 transformPoint(Float3 p)
{
Float4 tP = this.mul(new Float4(p, 1));
return(tP.xyz * (1f / tP.w));
}
private void RenderTriangle2(Vertex _v1, Vertex _v2, Vertex _v3, Material material, Float3 lightDirection)
{
IVertex v1 = new IVertex(_v1);
IVertex v2 = new IVertex(_v2);
IVertex v3 = new IVertex(_v3);
if (v1.y > v2.y) Utils.swap(ref v1, ref v2);
if (v1.y > v3.y) Utils.swap(ref v1, ref v3);
if (v2.y > v3.y) Utils.swap(ref v2, ref v3);
int triangleYHeight = v3.y - v1.y + 1;
int firstSegmentHeight = v2.y - v1.y + 1;
int secondSegmentHeight = v3.y - v2.y + 1;
for (int y = v1.y; y <= v3.y; y++)
{
bool isFirstSegment = y < v2.y;
int segmentStartY = isFirstSegment ? v1.y : v2.y;
float alpha = (float)(y - v1.y) / (float)triangleYHeight;
IVertex A = IVertex.lerp(v1, v3, alpha);
float beta = (float)(y - segmentStartY) / (float)(isFirstSegment ? firstSegmentHeight : secondSegmentHeight);
IVertex B = IVertex.lerp(isFirstSegment ? v1 : v2, isFirstSegment ? v2 : v3, beta);
if (A.x > B.x)
Utils.swap(ref A, ref B);
for (int x = A.x; x <= B.x; x++)
{
// check extremes
float delta = (A.x == B.x) ? 1.0f : (float)(x - A.x) / (float)(B.x - A.x);
IVertex C = IVertex.lerp(A, B, delta);
float lc = getLamberComponent(C.normal, lightDirection);
int intLambert = (int)(lc * 255);
Color c = Color.FromArgb(intLambert, intLambert, intLambert);
c = tex2D(material.diffuseTexture, C.u, C.v);
DrawPointToFrameBuffer(x, y, C.z, c);
}
}
}
public static Float3 lerp(Float3 start, Float3 end, float delta)
{
return(start + (end - start) * delta);
}
public Float3 transformPoint(Float3 p)
{
Float4 tP = this.mul(new Float4(p, 1));
return tP.xyz * (1f / tP.w);
}
public static Float4x4 getTranslationMatrix(Float3 t)
{
return new Float4x4(1 , 0 , 0 , 0,
0 , 1 , 0 , 0,
0 , 0 , 1 , 0,
t.x, t.y, t.z, 1);
}
public static Mesh ReadMeshFromFile(string filePath)
{
Mesh result = new Mesh();
string[] lines = File.ReadAllLines(filePath);
List<Float3> normals = new List<Float3>();
List<Float3> vPositions = new List<Float3>();
List<Float2> uvs = new List<Float2>();
List<WObjTriangle> wTriangles = new List<WObjTriangle>();
for (int i = 0; i < lines.Length; i++)
{
if (lines[i].Length == 0)
continue;
string[] lineParts = ReplaceMultipleSpaces(lines[i]).Split(' ');
// vertex positions
if (lineParts[0] == "v")
{
Float3 position = new Float3(float.Parse(lineParts[1], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[2], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[3], System.Globalization.CultureInfo.InvariantCulture)
);
vPositions.Add(position);
}
// uv coordinates
if (lineParts[0] == "vt")
{
Float2 uv = new Float2(float.Parse(lineParts[1], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[2], System.Globalization.CultureInfo.InvariantCulture));
uvs.Add(uv);
}
// normals
if (lineParts[0] == "vn")
{
Float3 normal = new Float3(float.Parse(lineParts[1], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[2], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[3], System.Globalization.CultureInfo.InvariantCulture)
);
normals.Add(normal);
}
if (lineParts[0] == "f")
{
string[] f1 = lineParts[1].Split('/');
string[] f2 = lineParts[2].Split('/');
string[] f3 = lineParts[3].Split('/');
int v1 = int.Parse(f1[0]);
int v2 = int.Parse(f2[0]);
int v3 = int.Parse(f3[0]);
int t1 = -1;
int t2 = -1;
int t3 = -1;
// if texture coordinates specified
if (f1.Length > 1)
{
if (!string.IsNullOrEmpty(f1[1]))
t1 = int.Parse(f1[1]);
if (!string.IsNullOrEmpty(f2[1]))
t2 = int.Parse(f2[1]);
if (!string.IsNullOrEmpty(f3[1]))
t3 = int.Parse(f3[1]);
}
int n1 = 0, n2 = 0, n3 = 0;
// if normals specified
if (f1.Length > 2) {
n1 = int.Parse(f1[2]);
n2 = int.Parse(f2[2]);
n3 = int.Parse(f3[2]);
}
wTriangles.Add(new WObjTriangle(v1, v2, v3, n1, n2, n3, t1, t2, t3));
result.Triangles.Add(new Triangle(v1, v2, v3));
}
}
result.Vertices = new List<Vertex>();
for(int i = 0; i < vPositions.Count; i++)
{
result.Vertices.Add(new Vertex(vPositions[i]));
}
for(int i = 0; i < wTriangles.Count; i++)
{
WObjTriangle wTriangle = wTriangles[i];
Vertex v1 = result.Vertices[wTriangle.v1 - 1];
Vertex v2 = result.Vertices[wTriangle.v2 - 1];
Vertex v3 = result.Vertices[wTriangle.v3 - 1];
if(normals.Count > 0)
{
v1.normal = normals[wTriangle.n1 - 1];
v2.normal = normals[wTriangle.n2 - 1];
v3.normal = normals[wTriangle.n3 - 1];
}
if (uvs.Count > 0)
{
if (wTriangle.uv1 < 0 || wTriangle.uv2 < 0 || wTriangle.uv3 < 0)
continue;
v1.uv = uvs[wTriangle.uv1 - 1];
v2.uv = uvs[wTriangle.uv2 - 1];
v3.uv = uvs[wTriangle.uv3 - 1];
}
}
return result;
}
public void setTranslation(Float3 t)
{
this._m[3, 0] = t.x;
this._m[3, 1] = t.y;
this._m[3, 2] = t.z;
}
public Float3x3(Float3[] rows)
:this(rows[0].x, rows[0].y, rows[0].z,
rows[1].x, rows[1].y, rows[1].z,
rows[2].x, rows[2].y, rows[2].z)
{}
