WPF 3d prostor - Spotlight, ne znam uporabljat

Zdej sem se mau začet učit 3d grafiko. Narisal sem en prostor polovico kocke, in postavil v prostor spot light. Fora je v tem da mi tiste polovico kocke sploh ne osvetli...



Js bi rad da je lučka na lokaciji 2,1,2 kot na slikci, sveti pa na ploskev y-z. se pravi bi mogla svetit v negativni x, se pravi 1,0,0. Ampak nič ne dela.

Tko mam nastavljen

<SpotLight Color="Red" OuterConeAngle="20" InnerConeAngle="20" Position="2,1,2" Direction="-1,0,0" />

Kako se to uporablja ker mi ni nč jasn.

Point3D A = new Point3D(0, 0, 5);
Point3D B = new Point3D(0, 0, 0);
Point3D C = new Point3D(5, 0, 0);
Point3D D = new Point3D(5, 5, 0);
Point3D E = new Point3D(0, 5, 0);
Point3D F = new Point3D(0, 5, 5);
Point3D G = new Point3D(5, 0, 5);

////////////////

mesh.Positions.Add(A);
mesh.Positions.Add(B);
mesh.Positions.Add(C);
mesh.Positions.Add(D);
mesh.Positions.Add(E);
mesh.Positions.Add(F);
mesh.Positions.Add(G);

mesh.TriangleIndices.Add(5);
mesh.TriangleIndices.Add(1);
mesh.TriangleIndices.Add(4);

mesh.TriangleIndices.Add(0);
mesh.TriangleIndices.Add(1);
mesh.TriangleIndices.Add(5);

mesh.TriangleIndices.Add(1);
mesh.TriangleIndices.Add(3);
mesh.TriangleIndices.Add(4);

mesh.TriangleIndices.Add(1);
mesh.TriangleIndices.Add(2);
mesh.TriangleIndices.Add(3);

mesh.TriangleIndices.Add(0);
mesh.TriangleIndices.Add(6);
mesh.TriangleIndices.Add(1);

mesh.TriangleIndices.Add(1);
mesh.TriangleIndices.Add(6);
mesh.TriangleIndices.Add(2);

<PerspectiveCamera 
 FarPlaneDistance="100"
 LookDirection="-20,-4,-20"
 UpDirection="0,1,0"
 NearPlaneDistance="1" 
 Position="20,4,20" 
 FieldOfView="70" />

Aha ja zdej štekam. Če pa dam lučko bol široko pol pa seže do teh #D Point pol se pa vid luč. Al pa če luč usmerm v 0,0,0.
Zdej štekam to kar si napisu, hvala.

Ok, sem nekaj spacau skupi. Sm hotu narest to kar si ti. Samo eno ploskev, pa lučko.
Nevem kako se ploskev riše, če pogledaš kodo pa poveš a se ploskev tako riše?

MeshGeometry3D mesh = new MeshGeometry3D();

const float _2WDT = 0.1F;
const float SIZE = 5.0F;
int i = 3;
Vector3D normal = new Vector3D(0, 1, 0);

for (float x = 0; x < SIZE; x += _2WDT)
{
	for (float z = 0; z < SIZE; z += _2WDT)
	{
		mesh.Positions.Add(new Point3D(x, 0, z)); // A
		mesh.Positions.Add(new Point3D(x + _2WDT, 0, z)); // B
		mesh.Positions.Add(new Point3D(x + _2WDT, 0, z + _2WDT)); // C
		mesh.Positions.Add(new Point3D(x, 0, z + _2WDT)); // D

		mesh.Normals.Add(normal);
		mesh.Normals.Add(normal);
		mesh.Normals.Add(normal);
		mesh.Normals.Add(normal);

		mesh.TriangleIndices.Add(i);
		mesh.TriangleIndices.Add(i - 2);
		mesh.TriangleIndices.Add(i - 3);

		mesh.TriangleIndices.Add(i);
		mesh.TriangleIndices.Add(i - 1);
		mesh.TriangleIndices.Add(i - 2);

		i += 4;
	}
}

Material material = new DiffuseMaterial(new SolidColorBrush(Colors.Blue));
GeometryModel3D myGeometryModel3D = new GeometryModel3D(mesh, material);

SpotLight slight = new SpotLight(Color.FromRgb(100, 100, 100), new Point3D(2.5, 2, 2.5), new Vector3D(0, -1, 0), 20, 5);

Model3DGroup myModel3DGroup = new Model3DGroup();
myModel3DGroup.Children.Add(myGeometryModel3D);
myModel3DGroup.Children.Add(slight);

ModelVisual3D myModelVisual3D = new ModelVisual3D ()
myModelVisual3D.Content = myModel3DGroup;

this.mainViewport.Children.Add(myModelVisual3D);

<Window x:Class="test.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="527" Width="682">
    <Grid>
        <DockPanel 
          Width="Auto" 
          VerticalAlignment="Stretch" 
          Height="Auto" 
          HorizontalAlignment="Stretch" 
          Grid.ColumnSpan="1" 
          Grid.Column="0" 
          Grid.Row="0" 
          Margin="0,0,0,0" 
          Grid.RowSpan="1" Background="Black">
            <Viewport3D Name="mainViewport" ClipToBounds="True">
                <Viewport3D.Camera>
                    <PerspectiveCamera 
	                  FarPlaneDistance="100"
	                  LookDirection="0,-15,0"
	                  UpDirection="0,0,-1"
	                  NearPlaneDistance="1" 
	                  Position="2,15,2" 
	                  FieldOfView="70" />
                </Viewport3D.Camera>
                <ModelVisual3D>
                    <ModelVisual3D.Content>
                        <DirectionalLight Color="Blue" Direction="0,-1,0" />
						<!--<SpotLight Color="White" OuterConeAngle="50" InnerConeAngle="5" Position="2.5,3,2.5" Direction="0,-1,0" />-->
					</ModelVisual3D.Content>
                </ModelVisual3D>
            </Viewport3D>
        </DockPanel>
    </Grid>
</Window>

Fora pa je da lučke SpotLight sploh ne vidm, če je DirectionalLight uklopljena

Ja sej je blo tko, da se je neki povozil. No zdej sm naredu sfero z odrezano kapco. Tko da lahk še not pogledam.

Ampak neki mi ne dela.
Če zgenerirram use točke za sfero.
1. pol pa še TriangleIndices povežem tako da se vidi vidi zunanjo plast sfere, je use ok.
2. Če pa dodam še TriangleIndices pa jih povežem mal drgač, da bi se vidla še notranja stran sfere, pa se neki grdo skvar.
Al kako bi lahko naredu, da bi se te trikotnički vidl z obeh strani?

Ja sej tko sm naredu, pa ne dela.



Pol sm jih pa še kontra povezu


PA obe sferi sta enako obrnejni, da mata lukno na istem mestu na sliki. Sam na drugi se je ne vidi dobr. Js jo vrtim tuki, pa se bol vidi lukno.
Če pa narišem dve sferi ne celi eno iz notranje strani eno pa z zunanje pa zgleda ok

Seveda lahko. Bom samo del ki shrani točke in poveže indice... Če pa rabš še ostalo bom pa še ostalo napisu.

void SphereCoordinates(float fi, float ro, float r, ref float x, ref float y, ref float z)
{
	float h = (float)(r * Math.Sin(fi * Math.PI / 180));
	y = (float)(r * Math.Cos(fi * Math.PI / 180));
	x = (float)(h * Math.Cos(ro * Math.P / 180));
	z = (float)(h * Math.Sin(ro * Math.PI / 180));
}


void DrawSphere ()
{
	const float _STEP = 1F;
	const float R = 10.0F;
	float x, y, z;
	x = y = z = 0;
	int i = 0;

	float ds = 25;

	Point3D p0, p1, p2, p3;

	for (float fi = 180; fi > ds; fi -= _STEP)
	{
		for (float ro = 360; ro > 0; ro -= _STEP)
		{
			SphereCoordinates(fi, ro, R, ref x, ref y, ref z);
			mesh.Positions.Add(p0 = new Point3D(x, y, z)); // 1
			SphereCoordinates(fi, ro - _STEP, R, ref x, ref y, ref z);
			mesh.Positions.Add(p1 = new Point3D(x, y, z)); // 2
			SphereCoordinates(fi - _STEP, ro, R, ref x, ref y, ref z);
			mesh.Positions.Add(p2 = new Point3D(x, y, z)); // 3
			SphereCoordinates(fi - _STEP, ro - _STEP, R, ref x, ref y, ref z);
			mesh.Positions.Add(p3 = new Point3D(x, y, z)); // 4

			// zunanja stran
			mesh.TriangleIndices.Add(i);
			mesh.TriangleIndices.Add(i + 1);
			mesh.TriangleIndices.Add(i + 2);

			mesh.TriangleIndices.Add(i + 2);
			mesh.TriangleIndices.Add(i + 1);
			mesh.TriangleIndices.Add(i + 3);
			
			// notranja stran
			mesh.TriangleIndices.Add(i + 2);
			mesh.TriangleIndices.Add(i + 1);
			mesh.TriangleIndices.Add(i);

			mesh.TriangleIndices.Add(i + 3);
			mesh.TriangleIndices.Add(i + 1);
			mesh.TriangleIndices.Add(i + 2);
			
			i += 4;
		}
	}
}

Točke pa tko računam:

Ne normal nimam. Zakaj so normale pomembne, zakaj se jih uporablja? Ker se mi nariše krogla brez normal sm pol naredu brez dodajanja normal.

NE. Najprej nardim koordinate za prvo kroglo, pa povežem indice da se vidi zunanja stran. Pol pa grem računat še koordinate druge krogle, ki je zamaknjena v y smer pa povežem indice da se vidi notranja stran. Lahko dam tut to kodo če te zanima.

Aha se pravi normale morjo bit. ok bom naredu.
Hvala za enkrat