private void CreateDisplayList(OpenGL gl)
{
displayList = new DisplayList();
displayList.Generate(gl);
displayList.New(gl, DisplayList.DisplayListMode.CompileAndExecute);
//Push all attributes, disable lighting and depth testing.
gl.PushAttrib(OpenGL.GL_CURRENT_BIT | OpenGL.GL_ENABLE_BIT |
OpenGL.GL_LINE_BIT | OpenGL.GL_DEPTH_BUFFER_BIT);
gl.Disable(OpenGL.GL_LIGHTING);
gl.Disable(OpenGL.GL_TEXTURE_2D);
gl.DepthFunc(OpenGL.GL_ALWAYS);
//Set line width.
gl.LineWidth(lineWidth);
//Draw the line.
gl.Begin(OpenGL.GL_LINES);
gl.Color(Convert.ColorToGLColor(c1));
gl.Vertex(v1.X, v1.Y, v1.Z);
gl.Color(Convert.ColorToGLColor(c2));
gl.Vertex(v2.X, v2.Y, v2.Z);
gl.End();
// Restore attributes.
gl.PopAttrib();
displayList.End(gl);
}
/// <summary>
/// Sets the attributes.
/// </summary>
/// <param name="gl">The OpenGL instance.</param>
public override void SetAttributes(OpenGL gl)
{
if (enableDepthTest.HasValue)
{
gl.EnableIf(OpenGL.GL_DEPTH_TEST, enableDepthTest.Value);
}
if (depthFunction.HasValue)
{
gl.DepthFunc(depthFunction.Value);
}
if (depthClearValue.HasValue)
{
gl.ClearDepth(depthClearValue.Value);
}
if (enableDepthWritemask.HasValue)
{
gl.EnableIf(OpenGL.GL_DEPTH_WRITEMASK, enableDepthWritemask.Value);
}
}
private void CreateDisplayList(OpenGL gl)
{
displayList = new DisplayList();
displayList.Generate(gl);
displayList.New(gl, DisplayList.DisplayListMode.CompileAndExecute);
//Push all attributes, disable lighting and depth testing.
gl.PushAttrib(OpenGL.GL_CURRENT_BIT | OpenGL.GL_ENABLE_BIT |
OpenGL.GL_LINE_BIT | OpenGL.GL_DEPTH_BUFFER_BIT);
gl.Disable(OpenGL.GL_LIGHTING);
gl.Disable(OpenGL.GL_TEXTURE_2D);
gl.DepthFunc(OpenGL.GL_ALWAYS);
//Set line width.
gl.LineWidth(lineWidth);
//Draw the line.
gl.Begin(OpenGL.GL_LINES);
for (float i = (size * -1); i < size; i+=0.4f)
{
float add = 0.2f;
if (i > 0) add = 0.4f;
if (i < 0 && i > -0.2f) add = 0.4f;
gl.Color(1f, 0f, 0f, 1f);
gl.Vertex(i, 0, 0);
gl.Vertex(i + add, 0, 0);
gl.Color(0f, 1f, 0f, 1f);
gl.Vertex(0, i, 0);
gl.Vertex(0, i + add, 0);
gl.Color(0f, 0f, 1f, 1f);
gl.Vertex(0, 0, i);
gl.Vertex(0, 0, i + add);
}
gl.End();
// Restore attributes.
gl.PopAttrib();
displayList.End(gl);
}
private void CreateDisplayList(OpenGL gl)
{
displayList = new DisplayList();
displayList.Generate(gl);
displayList.New(gl, DisplayList.DisplayListMode.CompileAndExecute);
//Push all attributes, disable lighting and depth testing.
gl.PushAttrib(OpenGL.GL_CURRENT_BIT | OpenGL.GL_ENABLE_BIT |
OpenGL.GL_LINE_BIT | OpenGL.GL_DEPTH_BUFFER_BIT);
gl.Disable(OpenGL.GL_LIGHTING);
gl.Disable(OpenGL.GL_TEXTURE_2D);
gl.DepthFunc(OpenGL.GL_ALWAYS);
//Set line width.
gl.LineWidth(lineWidth);
//Draw the line.
gl.Begin(OpenGL.GL_LINES);
for (int i = (size * -1); i <= size; i++)
{
if (i != 0)
{
if ((i % 4) == 0)
gl.Color(Convert.ColorToGLColor(darkColor));
else
gl.Color(Convert.ColorToGLColor(lightColor));
gl.Vertex(i, (size * -1), 0);
gl.Vertex(i, size, 0);
gl.Vertex((size * -1), i, 0);
gl.Vertex(size, i, 0);
}
}
gl.End();
// Restore attributes.
gl.PopAttrib();
displayList.End(gl);
}
public void Initialize(OpenGL gl)
{
this.gl = gl;
gl.Enable(OpenGL.GL_DEPTH_TEST);
gl.DepthFunc(DepthFunction.LessThanOrEqual);
gl.ClearDepth(1.0);
gl.ClearColor(0.0f, 0.0f, 0.0f, 0.0f);
gl.Hint(HintTarget.PerspectiveCorrection, HintMode.Nicest);
gl.Hint(HintTarget.LineSmooth, HintMode.Nicest);
gl.Hint(HintTarget.PointSmooth, HintMode.Nicest);
gl.Hint(HintTarget.PolygonSmooth, HintMode.Nicest);
gl.Enable(OpenGL.GL_SMOOTH);
gl.Enable(OpenGL.GL_LINE_SMOOTH);
gl.Enable(OpenGL.GL_POINT_SMOOTH);
gl.Enable(OpenGL.GL_MULTISAMPLE);
gl.MinSampleShading(4.0f);
}
/// <summary>
/// Creates the display list. This function draws the
/// geometry as well as compiling it.
/// </summary>
private void CreateDisplayList(OpenGL gl)
{
// Create the display list.
displayList = new DisplayList();
// Generate the display list and
displayList.Generate(gl);
displayList.New(gl, DisplayList.DisplayListMode.CompileAndExecute);
// Push all attributes, disable lighting and depth testing.
gl.PushAttrib(OpenGL.GL_CURRENT_BIT | OpenGL.GL_ENABLE_BIT |
OpenGL.GL_LINE_BIT | OpenGL.GL_DEPTH_BUFFER_BIT);
gl.Disable(OpenGL.GL_LIGHTING);
gl.Disable(OpenGL.GL_TEXTURE_2D);
gl.DepthFunc(OpenGL.GL_ALWAYS);
// Set a nice fat line width.
gl.LineWidth(1.50f);
// Draw the axies.
gl.Begin(OpenGL.GL_LINES);
gl.Color(1f, 0f, 0f, 1f);
gl.Vertex(0, 0, 0);
gl.Vertex(3, 0, 0);
gl.Color(0f, 1f, 0f, 1f);
gl.Vertex(0, 0, 0);
gl.Vertex(0, 3, 0);
gl.Color(0f, 0f, 1f, 1f);
gl.Vertex(0, 0, 0);
gl.Vertex(0, 0, 3);
gl.End();
// Restore attributes.
gl.PopAttrib();
// End the display list.
displayList.End(gl);
}
/// <summary>
/// This is called when a face is interactable, so highlight it.
/// </summary>
void IInteractable.DrawPick(OpenGL gl)
{
// Save all the attributes.
gl.PushAttrib(OpenGL.ALL_ATTRIB_BITS);
// Disable lighting, set colour to red etc.
gl.Disable(OpenGL.LIGHTING);
gl.DepthFunc(OpenGL.LEQUAL);
// Now draw it with a faint red.
gl.Enable(OpenGL.BLEND);
gl.BlendFunc(OpenGL.SRC_ALPHA, OpenGL.ONE_MINUS_SRC_ALPHA);
gl.Color(1, 0, 0, 0.2f);
// Draw the face.
gl.Begin(OpenGL.POLYGON);
foreach (Index index in indices)
{
gl.Vertex(parentpoly.Vertices[index.Vertex]);
}
gl.End();
gl.Disable(OpenGL.BLEND);
// Draw the face.
gl.Begin(OpenGL.LINE_LOOP);
for (int i = 0; i < indices.Count - 1; i++)
{
gl.Vertex(parentpoly.Vertices[indices[i].Vertex]);
}
gl.End();
gl.PopAttrib();
}
/// <summary>
/// Use this to draw the vertex grid.
/// </summary>
/// <param name="gl">OpenGL object.</param>
/// <param name="points">Draw each individual vertex (with selection names).</param>
/// <param name="lines">Draw the lines connecting the points.</param>
public virtual void Draw(OpenGL gl, bool points, bool lines)
{
// Save the attributes.
gl.PushAttrib(OpenGL.GL_ALL_ATTRIB_BITS);
gl.Disable(OpenGL.GL_LIGHTING);
gl.Color(1, 0, 0, 1);
if (points)
{
int name = 0;
gl.PointSize(5);
// Add a new name (the vertex name).
gl.PushName(0);
foreach (Vertex v in vertices)
{
// Set the name, draw the vertex.
gl.LoadName((uint)name++);
//todo draw vertex
//((IInteractable)v).DrawPick(gl);
}
// Pop the name.
gl.PopName();
}
if (lines)
{
// Draw lines along each row, then along each column.
gl.DepthFunc(OpenGL.GL_ALWAYS);
gl.LineWidth(1);
gl.Disable(OpenGL.GL_LINE_SMOOTH);
for (int col = 0; col < y; col++)
{
for (int row = 0; row < x; row++)
{
// Create vertex indicies.
int nTopLeft = (col * x) + row;
int nBottomLeft = ((col + 1) * x) + row;
gl.Begin(OpenGL.GL_LINES);
if (row < (x - 1))
{
gl.Vertex(vertices[nTopLeft]);
gl.Vertex(vertices[nTopLeft + 1]);
}
if (col < (y - 1))
{
gl.Vertex(vertices[nTopLeft]);
gl.Vertex(vertices[nBottomLeft]);
}
gl.End();
}
}
gl.DepthFunc(OpenGL.GL_LESS);
}
gl.PopAttrib();
}
public static void MyGlobalAxis(SharpGL.OpenGL gl, int AxesLength = 20, int LineWidth = 2, int Pointsize = 3, Boolean DoMinusTicks = true,
Boolean TagOrigin = true, Boolean DoXYZAnnotation = true, Boolean DoMinusXYZAnnotation = true, Boolean DoUnitTicks = true,
Boolean DoAnnotateZTicks = true, Boolean DoAnnotateYTicks = true, Boolean DoAnnotateXTicks = true, Boolean DoPlusTicks = true, float tick_annotation_scale = 0.4f,
Boolean Draw_Minus_Z_Axis_Leg = true, Boolean Draw_Minus_Y_Axis_Leg = true, Boolean Draw_Minus_X_Axis_Leg = true)
{
gl.PushMatrix( );
gl.PushAttrib(SharpGL.OpenGL.GL_CURRENT_BIT | SharpGL.OpenGL.GL_ENABLE_BIT | SharpGL.OpenGL.GL_LINE_BIT | SharpGL.OpenGL.GL_DEPTH_BUFFER_BIT);
gl.Disable(SharpGL.OpenGL.GL_LIGHTING);
gl.Disable(SharpGL.OpenGL.GL_TEXTURE_2D);
gl.DepthFunc(SharpGL.OpenGL.GL_ALWAYS);
gl.LineWidth(LineWidth);
// Draw the axis and annotate the ends.
if (TagOrigin)
{
gl.Color(White);
gl.PointSize(Pointsize);
gl.Vertex(Origin);
gl.PushMatrix( );
gl.DrawText3D(AxisLabelFont, 10.0f, 0.0f, 0.2f, "0");
gl.PopMatrix( );
}
gl.Color(Red);
gl.Begin(SharpGL.OpenGL.GL_LINES);
gl.Vertex(Origin);
gl.Vertex(AxesLength, 0, 0);
gl.End( );
if (Draw_Minus_X_Axis_Leg)
{
gl.Color(Red);
gl.Begin(SharpGL.OpenGL.GL_LINES);
gl.Vertex(Origin);
gl.Vertex(-AxesLength, 0, 0);
gl.End( );
}
if (DoXYZAnnotation)
{
gl.PushMatrix( );
gl.Translate(AxesLength, 0, 0);
gl.DrawText3D(AxisLabelFont, 10.0f, 0.0f, 0.2f, "+X");
gl.PopMatrix( );
}
if (DoMinusXYZAnnotation)
{
gl.PushMatrix( );
gl.Translate(-AxesLength, 0, 0);
gl.DrawText3D(AxisLabelFont, 10.0f, 0.0f, 0.2f, "-X");
gl.PopMatrix( );
}
gl.Color(Green);
gl.Begin(SharpGL.OpenGL.GL_LINES);
gl.Vertex(Origin);
gl.Vertex(0, AxesLength, 0);
gl.End( );
if (Draw_Minus_Y_Axis_Leg)
{
gl.Color(Green);
gl.Begin(SharpGL.OpenGL.GL_LINES);
gl.Vertex(Origin);
gl.Vertex(0, -AxesLength, 0);
gl.End( );
}
if (DoXYZAnnotation)
{
gl.PushMatrix( );
gl.Translate(0, AxesLength, 0);
gl.DrawText3D(AxisLabelFont, 10.0f, 0.0f, 0.1f, "+Y");
gl.PopMatrix( );
}
if (DoMinusXYZAnnotation)
{
gl.PushMatrix( );
gl.Translate(0, -AxesLength, 0);
gl.DrawText3D(AxisLabelFont, 10.0f, 0.0f, 0.1f, "-Y");
gl.PopMatrix( );
}
if (true)
{
gl.Color(Blue);
gl.Begin(SharpGL.OpenGL.GL_LINES);
gl.Vertex(Origin);
gl.Vertex(0, 0, AxesLength);
gl.End( );
}
if (Draw_Minus_Z_Axis_Leg)
{
gl.Color(Blue);
gl.Begin(SharpGL.OpenGL.GL_LINES);
gl.Vertex(Origin);
gl.Vertex(0, 0, -AxesLength);
gl.End( );
}
if (DoXYZAnnotation)
{
gl.PushMatrix( );
gl.Translate(0, 0, AxesLength);
gl.DrawText3D(AxisLabelFont, 10.0f, 0.0f, 0.05f, "+Z");
gl.PopMatrix( );
}
if (DoMinusXYZAnnotation && Draw_Minus_Z_Axis_Leg)
{
gl.PushMatrix( );
gl.Translate(0, 0, -AxesLength);
gl.DrawText3D(AxisLabelFont, 10.0f, 0.0f, 0.05f, "-Z");
gl.PopMatrix( );
}
if (DoUnitTicks)
{
gl.PointSize(Pointsize);
gl.Color(White);
for (int i = 0; i < AxesLength; i++)
{
if (DoPlusTicks)
{
gl.Begin(SharpGL.Enumerations.BeginMode.Points);
gl.Vertex(i, 0, 0);
gl.Vertex(0, i, 0);
gl.Vertex(0, 0, i);
gl.End( );
}
if (DoMinusTicks)
{
gl.Begin(SharpGL.Enumerations.BeginMode.Points);
gl.Vertex(-i, 0, 0);
gl.Vertex(0, -i, 0);
if (Draw_Minus_Z_Axis_Leg)
{
gl.Vertex(0, 0, -i);
}
gl.End( );
}
if (DoAnnotateZTicks)
{
gl.PushMatrix( );
gl.Translate(0, 0, i);
gl.Scale(tick_annotation_scale, tick_annotation_scale, tick_annotation_scale);
gl.DrawText3D(faceName: AxisLabelFont, fontSize: .1f, deviation: 0.0f, extrusion: 0.05f, text: i.ToString( ));
gl.PopMatrix( );
}
if (DoMinusTicks && Draw_Minus_Z_Axis_Leg)
{
gl.PushMatrix( );
gl.Translate(0, 0, -i);
gl.Scale(tick_annotation_scale, tick_annotation_scale, tick_annotation_scale);
gl.DrawText3D(faceName: AxisLabelFont, fontSize: .1f, deviation: 0.0f, extrusion: 0.05f, text: (-i).ToString( ));
gl.PopMatrix( );
}
if (DoAnnotateYTicks)
{
gl.PushMatrix( );
gl.Translate(0, i, 0);
gl.Scale(tick_annotation_scale, tick_annotation_scale, tick_annotation_scale);
gl.DrawText3D(faceName: AxisLabelFont, fontSize: .1f, deviation: 0.0f, extrusion: 0.05f, text: i.ToString( ));
gl.PopMatrix( );
}
if (DoMinusTicks)
{
gl.PushMatrix( );
gl.Translate(0, -i, 0);
gl.Scale(tick_annotation_scale, tick_annotation_scale, tick_annotation_scale);
gl.DrawText3D(faceName: AxisLabelFont, fontSize: .1f, deviation: 0.0f, extrusion: 0.05f, text: (-i).ToString( ));
gl.PopMatrix( );
}
if (DoAnnotateXTicks)
{
gl.PushMatrix( );
gl.Translate(i, 0, 0);
gl.Scale(tick_annotation_scale, tick_annotation_scale, tick_annotation_scale);
gl.DrawText3D(faceName: AxisLabelFont, fontSize: .1f, deviation: 0.0f, extrusion: 0.05f, text: i.ToString( ));
gl.PopMatrix( );
}
if (DoMinusTicks)
{
gl.PushMatrix( );
gl.Translate(-i, 0, 0);
gl.Scale(tick_annotation_scale, tick_annotation_scale, tick_annotation_scale);
gl.DrawText3D(faceName: AxisLabelFont, fontSize: .1f, deviation: 0.0f, extrusion: 0.05f, text: (-i).ToString( ));
gl.PopMatrix( );
}
}
}
// Restore attributes.
gl.PopAttrib( );
gl.PopMatrix( );
}
/// <summary>
/// Casts a real time 3D shadow.
/// </summary>
/// <param name="gl">The OpenGL object.</param>
/// <param name="lights">The lights.</param>
private void CastShadow(OpenGL gl)
{
// Set the connectivity, (calculate the neighbours of each face).
SetConnectivity();
// Get the lights in the scene.
var lights = TraverseToRootElement().Traverse <Light>(l => l.IsEnabled && l.On && l.CastShadow);
// Get some useful references.
var faces = ParentPolygon.Faces;
// Go through every light in the scene.
foreach (var light in lights)
{
// Every face will have a visibility setting.
bool[] facesVisible = new bool[faces.Count];
// Get the light position relative to the polygon.
Vertex lightPos = light.Position;
lightPos = lightPos - ParentPolygon.Transformation.TranslationVertex;
// Go through every face, finding out whether it's visible to the light.
for (int nFace = 0; nFace < faces.Count; nFace++)
{
// Get a reference to the face.
Face face = faces[nFace];
// Is this face facing the light?
float[] planeEquation = face.GetPlaneEquation(ParentPolygon);
float side = planeEquation[0] * lightPos.X +
planeEquation[1] * lightPos.Y +
planeEquation[2] * lightPos.Z + planeEquation[3];
facesVisible[nFace] = (side > 0) ? true : false;
}
// Save all the attributes.
gl.PushAttrib(OpenGL.GL_ALL_ATTRIB_BITS);
// Turn off lighting.
gl.Disable(OpenGL.GL_LIGHTING);
// Turn off writing to the depth mask.
gl.DepthMask(0);
gl.DepthFunc(OpenGL.GL_LEQUAL);
// Turn on stencil buffer testing.
gl.Enable(OpenGL.GL_STENCIL_TEST);
// Translate our shadow volumes.
ParentPolygon.PushObjectSpace(gl);
// Don't draw to the color buffer.
gl.ColorMask(0, 0, 0, 0);
gl.StencilFunc(OpenGL.GL_ALWAYS, 1, 0xFFFFFFFF);
gl.Enable(OpenGL.GL_CULL_FACE);
// First Pass. Increase Stencil Value In The Shadow
gl.FrontFace(OpenGL.GL_CCW);
gl.StencilOp(OpenGL.GL_KEEP, OpenGL.GL_KEEP, OpenGL.GL_INCR);
DoShadowPass(gl, lightPos, facesVisible);
// Second Pass. Decrease Stencil Value In The Shadow
gl.FrontFace(OpenGL.GL_CW);
gl.StencilOp(OpenGL.GL_KEEP, OpenGL.GL_KEEP, OpenGL.GL_DECR);
DoShadowPass(gl, lightPos, facesVisible);
gl.FrontFace(OpenGL.GL_CCW);
ParentPolygon.PopObjectSpace(gl);
// Enable writing to the color buffer.
gl.ColorMask(1, 1, 1, 1);
// Draw A Shadowing Rectangle Covering The Entire Screen
gl.Color(light.ShadowColor);
gl.Enable(OpenGL.GL_BLEND);
gl.BlendFunc(OpenGL.GL_SRC_ALPHA, OpenGL.GL_ONE_MINUS_SRC_ALPHA);
gl.StencilFunc(OpenGL.GL_NOTEQUAL, 0, 0xFFFFFFF);
gl.StencilOp(OpenGL.GL_KEEP, OpenGL.GL_KEEP, OpenGL.GL_KEEP);
Sphere shadow = new Sphere();
shadow.Transformation.ScaleX = shadowSize;
shadow.Transformation.ScaleY = shadowSize;
shadow.Transformation.ScaleZ = shadowSize;
shadow.Render(gl, RenderMode.Design);
gl.PopAttrib();
}
}
/// <summary>
/// Use this to draw the vertex grid.
/// </summary>
/// <param name="gl">OpenGL object.</param>
/// <param name="points">Draw each individual vertex (with selection names).</param>
/// <param name="lines">Draw the lines connecting the points.</param>
public virtual void Draw(OpenGL gl, bool points, bool lines)
{
// Save the attributes.
gl.PushAttrib(OpenGL.ALL_ATTRIB_BITS);
gl.Disable(OpenGL.LIGHTING);
gl.Color(1, 0, 0, 1);
if(points)
{
int name = 0;
gl.PointSize(5);
// Add a new name (the vertex name).
gl.PushName(0);
foreach(Vertex v in vertices)
{
// Set the name, draw the vertex.
gl.LoadName((uint)name++);
((IInteractable)v).DrawPick(gl);
}
// Pop the name.
gl.PopName();
}
if(lines)
{
// Draw lines along each row, then along each column.
gl.DepthFunc(OpenGL.ALWAYS);
gl.LineWidth(1);
gl.Disable(OpenGL.LINE_SMOOTH);
for(int col=0; col < y; col++)
{
for(int row=0; row < x; row++)
{
// Create vertex indicies.
int nTopLeft = (col * x) + row;
int nBottomLeft = ((col + 1) * x) + row;
gl.Begin(OpenGL.LINES);
if(row < (x-1))
{
gl.Vertex(vertices[nTopLeft]);
gl.Vertex(vertices[nTopLeft + 1]);
}
if(col < (y-1))
{
gl.Vertex(vertices[nTopLeft]);
gl.Vertex(vertices[nBottomLeft]);
}
gl.End();
}
}
gl.DepthFunc(OpenGL.LESS);
}
gl.PopAttrib();
}
/// <summary>
/// This is called when a face is interactable, so highlight it.
/// </summary>
void IInteractable.DrawPick(OpenGL gl)
{
// Save all the attributes.
gl.PushAttrib(OpenGL.ALL_ATTRIB_BITS);
// Disable lighting, set colour to red etc.
gl.Disable(OpenGL.LIGHTING);
gl.DepthFunc(OpenGL.LEQUAL);
// Now draw it with a faint red.
gl.Enable(OpenGL.BLEND);
gl.BlendFunc(OpenGL.SRC_ALPHA, OpenGL.ONE_MINUS_SRC_ALPHA);
gl.Color(1, 0, 0, 0.2f);
// Draw the face.
gl.Begin(OpenGL.POLYGON);
foreach(Index index in indices)
gl.Vertex(parentpoly.Vertices[index.Vertex]);
gl.End();
gl.Disable(OpenGL.BLEND);
// Draw the face.
gl.Begin(OpenGL.LINE_LOOP);
for(int i = 0; i < indices.Count - 1; i++)
gl.Vertex(parentpoly.Vertices[indices[i].Vertex]);
gl.End();
gl.PopAttrib();
}
