Method generateGraphicsMesh

testbed/common/HeightField.cpp:184–224

Generate the graphics mesh to render the height field

// Generate the graphics mesh to render the height field
void HeightField::generateGraphicsMesh() {

    std::vector<unsigned int> indices;
    int vertexId = 0;

    for (int i=0; i<NB_POINTS_WIDTH; i++) {
        for (int j=0; j<NB_POINTS_LENGTH; j++) {

            float originHeight = -(mMaxHeight - mMinHeight) * 0.5f - mMinHeight;
            float height = originHeight + mHeightData[j * NB_POINTS_WIDTH + i];
            openglframework::Vector3 vertex(-(NB_POINTS_WIDTH - 1) * 0.5f + i, height, -(NB_POINTS_LENGTH - 1) * 0.5f + j);

            mVertices.push_back(vertex);

            // Triangle indices
            if ((i < NB_POINTS_WIDTH - 1) && (j < NB_POINTS_LENGTH - 1)) {

                unsigned int v1 = vertexId;
                unsigned int v2 = vertexId + 1;
                unsigned int v3 = vertexId + NB_POINTS_LENGTH;
                unsigned int v4 = vertexId + NB_POINTS_LENGTH + 1;

                // First triangle
                indices.push_back(v1);
                indices.push_back(v2);
                indices.push_back(v3);

                // Second triangle
                indices.push_back(v2);
                indices.push_back(v4);
                indices.push_back(v3);
            }

            vertexId++;
        }
    }

    mIndices.push_back(indices);

    calculateNormals();
}

// Create the Vertex Buffer Objects used to render with OpenGL.
/// We create two VBOs (one for vertices and one for indices)