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Diffstat (limited to 'dev/a6-harold/ground.cc')
| -rw-r--r-- | dev/a6-harold/ground.cc | 283 |
1 files changed, 0 insertions, 283 deletions
diff --git a/dev/a6-harold/ground.cc b/dev/a6-harold/ground.cc deleted file mode 100644 index 51d4d92..0000000 --- a/dev/a6-harold/ground.cc +++ /dev/null @@ -1,283 +0,0 @@ -/** CSci-4611 Assignment 6: Harold - */ - -#include "ground.h" - - -Ground::Ground() : diffuse_ramp_(GL_CLAMP_TO_EDGE), - specular_ramp_(GL_CLAMP_TO_EDGE), light_pos_(30,30,30) -{ - -} - -Ground::~Ground() { - -} - -Mesh* Ground::mesh_ptr() { return &ground_mesh_; } - - -void Ground::Init(const std::vector<std::string> &search_path) { - // init ground geometry, a simple grid is used. if it is running too slow, - // you can turn down the resolution by decreasing nx and ny, but this will - // make the hills look more jaggy. - const int nx = 150; - const int ny = 150; - const float size = 100.0; - std::vector<Point3> verts; - std::vector<Vector3> norms; - for (int j = 0; j <= ny; j++) { - for (int i = 0; i <= nx; i++) { - float x = size*(float)j/nx - size/2.0f; - float y = size*(float)i/ny - size/2.0f; - verts.push_back(Point3(x, 0, y)); - norms.push_back(Vector3(0,1,0)); - } - } - std::vector<unsigned int> indices; - for (int j = 0; j < ny; j++) { - for (int i = 0; i < nx; i++) { - // L\ triangle - indices.push_back((i+0)+(j+0)*(nx+1)); - indices.push_back((i+1)+(j+0)*(nx+1)); - indices.push_back((i+0)+(j+1)*(nx+1)); - // \7 triangle - indices.push_back((i+1)+(j+0)*(nx+1)); - indices.push_back((i+1)+(j+1)*(nx+1)); - indices.push_back((i+0)+(j+1)*(nx+1)); - } - } - ground_mesh_.SetIndices(indices); - ground_mesh_.SetVertices(verts); - ground_mesh_.SetNormals(norms); - ground_mesh_.UpdateGPUMemory(); - ground_edge_mesh_.CreateFromMesh(ground_mesh_); - - - // load textures and shaders - diffuse_ramp_.InitFromFile(Platform::FindFile("toonDiffuse.png", search_path)); - specular_ramp_.InitFromFile(Platform::FindFile("toonSpecular.png", search_path)); - - artsy_shaderprog_.AddVertexShaderFromFile(Platform::FindFile("artsy.vert", search_path)); - artsy_shaderprog_.AddFragmentShaderFromFile(Platform::FindFile("artsy.frag", search_path)); - artsy_shaderprog_.LinkProgram(); - - outline_shaderprog_.AddVertexShaderFromFile(Platform::FindFile("outline.vert", search_path)); - outline_shaderprog_.AddFragmentShaderFromFile(Platform::FindFile("outline.frag", search_path)); - outline_shaderprog_.LinkProgram(); -} - - - - -// Projects a 2D normalized screen point (e.g., the mouse position in normalized -// device coordinates) to a 3D point on the ground. Returns true and sets ground_point -// to be equal to the result if the conversion is successful. Returns false if -// the screen point does not project onto the ground. -bool Ground::ScreenPtHitsGround(const Matrix4 &view_matrix, const Matrix4 &proj_matrix, - const Point2 &normalized_screen_pt, Point3 *ground_point) -{ - Matrix4 camera_matrix = view_matrix.Inverse(); - Point3 eye = camera_matrix.ColumnToPoint3(3); - - Point3 pt3d = GfxMath::ScreenToNearPlane(view_matrix, proj_matrix, normalized_screen_pt); - Ray ray(eye, (pt3d - eye).ToUnit()); - float i_time; - int i_tri; - return ray.FastIntersectMesh(&ground_mesh_, &i_time, ground_point, &i_tri); -} - - - - -/** This implements the "h" term used in the equations described in section 4.5 of the - paper. Three arguments are needed: - 1. projection_plane_normal: We need to know where the projection plane is in 3-space - Since a plane can be defined by a point within the plane and a normal, we use - this normal together with the 3rd argument to the function to define the projection - plane described in the paper. - 2. silhouette_curve: As described in the paper, the silhouette curve is a 3D version - of the curve the user draws with the mouse. It is formed by projecting the - original 2D screen-space curve onto the 3D projection plane. - 3. closest_pt_in_plane: As described in the paper, this is the closest point within - the projection plane to the vertex of the mesh that we want to modify. In other - words, it is the perpendicular projection of the vertex we want to modify onto - the projection plane. - */ -float hfunc(const Vector3 projection_plane_normal, const std::vector<Point3> &silhouette_curve, const Point3 &closest_pt_in_plane) { - // define the y axis for a "plane space" coordinate system as a world space vector - Vector3 plane_y = Vector3(0,1,0); - // define the x axis for a "plane space" coordinate system as a world space vector - Vector3 plane_x = plane_y.Cross(projection_plane_normal).ToUnit(); - // define the origin for a "plane space" coordinate system as the first point in the curve - Point3 origin = silhouette_curve[0]; - - // loop over line segments in the curve, find the one that lies over the point by - // comparing the "plane space" x value for the start and end of the line segment - // to the "plane space" x value for the closest point to the vertex that lies - // in the projection plane. - float x_target = (closest_pt_in_plane - origin).Dot(plane_x); - for (int i=1; i<silhouette_curve.size(); i++) { - float x_start = (silhouette_curve[(size_t)i-1] - origin).Dot(plane_x); - float x_end = (silhouette_curve[i] - origin).Dot(plane_x); - if ((x_start <= x_target) && (x_target <= x_end)) { - float alpha = (x_target - x_start) / (x_end - x_start); - float y_curve = silhouette_curve[(size_t)i-1][1] + alpha*(silhouette_curve[i][1] - silhouette_curve[(size_t)i-1][1]); - return y_curve - closest_pt_in_plane[1]; - } - else if ((x_end <= x_target) && (x_target <= x_start)) { - float alpha = (x_target - x_end) / (x_start - x_end); - float y_curve = silhouette_curve[i][1] + alpha*(silhouette_curve[(size_t)i-1][1] - silhouette_curve[i][1]); - return y_curve - closest_pt_in_plane[1]; - } - } - - // here return 0 because the point does not lie under the curve. - return 0.0; -} - - - - -/// Modifies the vertices of the ground mesh to create a hill or valley based -/// on the input stroke. The 2D path of the stroke on the screen is passed -/// in, this is the centerline of the stroke mesh that is actually drawn on -/// the screen while the user is drawing. -void Ground::ReshapeGround(const Matrix4 &view_matrix, const Matrix4 &proj_matrix, - const std::vector<Point2> &stroke2d) -{ - // TODO: Deform the 3D ground mesh according to the algorithm described in the - // Cohen et al. Harold paper. - - // You might need the eye point and the look vector, these can be determined - // from the view matrix as follows: - Matrix4 camera_matrix = view_matrix.Inverse(); - Point3 eye = camera_matrix.ColumnToPoint3(3); - Vector3 look = -camera_matrix.ColumnToVector3(2); - - - - // There are 3 major steps to the algorithm, outlined here: - - // 1. Define a plane to project the stroke onto. The first and last points - // of the stroke are guaranteed to project onto the ground plane. The plane - // should pass through these two points on the ground. The plane should also - // have a normal vector that points toward the camera and is parallel to the - // ground plane. - - - - - - // 2. Project the 2D stroke into 3D so that it lies on the "projection plane" - // defined in step 1. - - - - - - // 3. Loop through all of the vertices of the ground mesh, and adjust the - // height of each based on the equations in section 4.5 of the paper, also - // repeated in the assignment handout. The equations rely upon a function - // h(), and we have implemented that for you as hfunc() defined above in - // this file. The basic structure of the loop you will need is here: - std::vector<Point3> new_verts; - for (int i=0; i<ground_mesh_.num_vertices(); i++) { - Point3 P = ground_mesh_.read_vertex_data(i); // original vertex - - // adjust P according to equations... - - - - - - new_verts.push_back(P); - } - ground_mesh_.SetVertices(new_verts); - ground_mesh_.CalcPerVertexNormals(); - ground_mesh_.UpdateGPUMemory(); - ground_edge_mesh_.CreateFromMesh(ground_mesh_); -} - - - - -/// Draws the ground mesh with toon shading -void Ground::Draw(const Matrix4 &view_matrix, const Matrix4 &proj_matrix, const Color &ground_color) { - // Lighting parameters - Color Ia(1.0f, 1.0f, 1.0f, 1.0f); - Color Id(1.0f, 1.0f, 1.0f, 1.0f); - Color Is(1.0f, 1.0f, 1.0f, 1.0f); - - // Material parameters - Color ka = ground_color; - Color kd(0.4f, 0.4f, 0.4f, 1.0f); - Color ks(0.6f, 0.6f, 0.6f, 1.0f); - float s = 50.0f; - - // Precompute matrices needed in the shader - Matrix4 model_matrix; // identity - Matrix4 modelview_matrix = view_matrix * model_matrix; - Matrix4 normal_matrix = modelview_matrix.Inverse().Transpose(); - Point3 light_in_eye_space = view_matrix * light_pos_; - - // Make sure the default option to only draw front facing triangles is set - glEnable(GL_CULL_FACE); - - - // Draw the ground using the artsy shader - artsy_shaderprog_.UseProgram(); - artsy_shaderprog_.SetUniform("modelViewMatrix", modelview_matrix); - artsy_shaderprog_.SetUniform("normalMatrix", normal_matrix); - artsy_shaderprog_.SetUniform("projectionMatrix", proj_matrix); - artsy_shaderprog_.SetUniform("ka", ka); - artsy_shaderprog_.SetUniform("kd", kd); - artsy_shaderprog_.SetUniform("ks", ks); - artsy_shaderprog_.SetUniform("s", s); - artsy_shaderprog_.SetUniform("lightPosition", light_in_eye_space); - artsy_shaderprog_.SetUniform("Ia", Ia); - artsy_shaderprog_.SetUniform("Id", Id); - artsy_shaderprog_.SetUniform("Is", Is); - artsy_shaderprog_.BindTexture("diffuseRamp", diffuse_ramp_); - artsy_shaderprog_.BindTexture("specularRamp", specular_ramp_); - ground_mesh_.Draw(); - artsy_shaderprog_.StopProgram(); - - // And, draw silhouette edges for the ground using the outline shader - glDisable(GL_CULL_FACE); - glEnable(GL_POLYGON_OFFSET_FILL); - glPolygonOffset(1,1); - static const float thickness = 0.2f; - outline_shaderprog_.UseProgram(); - outline_shaderprog_.SetUniform("modelViewMatrix", modelview_matrix); - outline_shaderprog_.SetUniform("normalMatrix", normal_matrix); - outline_shaderprog_.SetUniform("projectionMatrix", proj_matrix); - outline_shaderprog_.SetUniform("thickness", thickness); - ground_edge_mesh_.Draw(); - outline_shaderprog_.StopProgram(); - - - - // This can be useful for debugging, but it is extremely slow to draw. - // Before uncommenting this, it's recommended to turn down the resolution - // of the ground mesh by adjusting the nx and ny constants inside Init(). - /** - // draw lines around each triangle - for (int t=0; t<ground_mesh_.num_triangles(); t++) { - std::vector<unsigned int> indices = ground_mesh_.triangle_vertices(t); - std::vector<Point3> loop; - loop.push_back(ground_mesh_.vertex(indices[0])); - loop.push_back(ground_mesh_.vertex(indices[1])); - loop.push_back(ground_mesh_.vertex(indices[2])); - qs_.DrawLines(model_matrix, view_matrix, proj_matrix, Color(0.7,0.7,0.7), loop, QuickShapes::LinesType::LINE_LOOP, 0.01); - } - - // draw normals - for (int i=0; i<ground_mesh_.num_vertices(); i++) { - Point3 p1 = ground_mesh_.vertex(i); - Point3 p2 = p1 + 0.5*ground_mesh_.normal(i); - qs_.DrawLineSegment(model_matrix, view_matrix, proj_matrix, Color(0.7,0.7,0.7), p1, p2, 0.01); - } - **/ -} - |