From fee4cbf40b07e17eca676b4687c51313f7cfdd2e Mon Sep 17 00:00:00 2001
From: unknown <paulx161@umn.edu>
Date: Thu, 4 Feb 2021 18:37:17 -0600
Subject: Added example projects from lecture

---
 dev/mesh-demo/example.cc | 107 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 dev/mesh-demo/example.cc

(limited to 'dev/mesh-demo/example.cc')

diff --git a/dev/mesh-demo/example.cc b/dev/mesh-demo/example.cc
new file mode 100644
index 0000000..759b09b
--- /dev/null
+++ b/dev/mesh-demo/example.cc
@@ -0,0 +1,107 @@
+/** CSci-4611 In-Class Example */
+
+#include "Example.h"
+
+#include <iostream>
+#include <sstream>
+
+
+
+Example::Example() : GraphicsApp(1024,768, "MinGfx Example") {
+}
+
+
+Example::~Example() {
+}
+
+
+void Example::UpdateSimulation(double dt)  {
+}
+
+
+void Example::InitOpenGL() {
+    // Set up the camera in a good position to see the entire scene
+    proj_matrix_ = Matrix4::Perspective(60.0f, aspect_ratio(), 0.01f, 100.0f);
+    view_matrix_ = Matrix4::LookAt(Point3(0,0,3), Point3(0,0,0), Vector3(0,1,0));
+    glClearColor(1,1,1,1);
+    
+    
+    // EXAMPLE 1:  Load the mesh from a file
+    teapot_mesh_.LoadFromOBJ(Platform::FindMinGfxDataFile("teapot.obj"));
+
+    
+    
+    
+    // EXAMPLE 2:  Create the mesh by adding triangles one at a time
+    int tri_id;
+    // add a first triangle
+    tri_id = triangles_mesh_.AddTriangle(Point3(0,0,0), Point3(1,0,0), Point3(1,1,0));
+    // set attributes for the vertices
+    triangles_mesh_.SetNormals(tri_id, Vector3(0,0,1), Vector3(0,0,1), Vector3(0,0,1));
+    // add a second triangle and attributes
+    tri_id = triangles_mesh_.AddTriangle(Point3(0,0,0), Point3(1,1,0), Point3(0,1,0));
+    triangles_mesh_.SetNormals(tri_id, Vector3(0,0,1), Vector3(0,0,1), Vector3(0,0,1));
+    // call this when done to save to the GPU
+    triangles_mesh_.UpdateGPUMemory();
+
+    
+     
+    
+     
+    // EXAMPLE 3:  Create the mesh by setting the vertex and index arrays directly
+    std::vector<unsigned int> indices;
+    std::vector<Point3> vertices;
+    std::vector<Vector3> normals;
+    
+    // four vertices, each requires 3 floats: (x,y,z)
+    vertices.push_back(Point3(0,0,0));
+    vertices.push_back(Point3(1,0,0));
+    vertices.push_back(Point3(1,1,0));
+    vertices.push_back(Point3(0,1,0));
+    
+    // four normals, each requires 3 floats: (x,y,z)
+    normals.push_back(Vector3(0,0,1));
+    normals.push_back(Vector3(0,0,1));
+    normals.push_back(Vector3(0,0,1));
+    normals.push_back(Vector3(0,0,1));
+    
+    // indices into the arrays above for the first triangle
+    indices.push_back(0);
+    indices.push_back(1);
+    indices.push_back(2);
+    
+    // indices for the second triangle, note some are reused
+    indices.push_back(0);
+    indices.push_back(2);
+    indices.push_back(3);
+    
+    indexed_tris_mesh_.SetVertices(vertices);
+    indexed_tris_mesh_.SetNormals(normals);
+    indexed_tris_mesh_.SetIndices(indices);
+    indexed_tris_mesh_.UpdateGPUMemory();
+    
+}
+
+
+void Example::DrawUsingOpenGL() {
+    // draws a set of axes at the world origin, since we are passing the identity
+    // matrix for the "model" matrix.
+    Matrix4 identity;
+    quick_shapes_.DrawAxes(identity, view_matrix_, proj_matrix_);
+    
+    
+
+    Matrix4 teapot_transform = Matrix4::Translation(Vector3(-1.5,0,0));
+    shader_.Draw(teapot_transform, view_matrix_, proj_matrix_, &teapot_mesh_, DefaultShader::MaterialProperties());
+
+    Matrix4 mesh2_transform = Matrix4::Translation(Vector3(-0.5,-0.5,0));
+    shader_.Draw(mesh2_transform, view_matrix_, proj_matrix_, &triangles_mesh_, DefaultShader::MaterialProperties());
+
+    Matrix4 mesh3_transform = Matrix4::Translation(Vector3(1,-0.5,0));
+    shader_.Draw(mesh3_transform, view_matrix_, proj_matrix_, &indexed_tris_mesh_, DefaultShader::MaterialProperties());
+}
+
+
+
+
+
-- 
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