cloth/cloth_handler.cpp at master · SteveMCWin/cloth · GitHub

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#include "cloth_handler.h"
#include <glm/vec3.hpp>
#include "spring.h"

ClothHandler::ClothHandler(glm::vec3 positions[Global::cloth_rows][Global::cloth_cols], float masses[Global::cloth_rows][Global::cloth_cols],
                           float spring_stiffness, float spring_rest_len, glm::vec3 pos){
    this->cloth_position = pos;
    for(int i = 0; i < Global::cloth_rows; i++){
        for(int j = 0; j < Global::cloth_cols; j++){
            this->cloth_vertices[i][j] = ClothVertex(positions[i][j], masses[i][j]);
        }
    }

    // v00 v01
    // v01 v02
    // ...
    // v07 v08
    // v08 v09
    // v10 v11
    // v11 v12
    // ...
    // v17 v18
    // v18 v19
    // v20 v21
    // v21 v22
    // ...
    // ...
    // ...
    // v97 v98
    // v98 v99
    for(int i = 0; i < Global::cloth_rows; i++){
        for(int j = 0; j < Global::cloth_cols-1; j++){
            horizontal_structural_springs[i][j] = Spring(spring_stiffness, spring_rest_len, &this->cloth_vertices[i][j], &this->cloth_vertices[i][j+1]);
        }
    }

    for(int i = 0; i < Global::cloth_rows; i++){
        for(int j = 0; j < Global::cloth_cols-3; j++){
            horizontal_bend_springs[i][j] = Spring(0.05 * spring_stiffness, 3 * spring_rest_len, &this->cloth_vertices[i][j], &this->cloth_vertices[i][j+3]);
        }
    }

    // v00 v10
    // v01 v11
    // ...
    // v08 v18
    // v09 v19
    // v10 v20
    // v11 v21
    // ...
    // v18 v28
    // v19 v29
    // v20 v30
    // ...
    // ...
    // ...
    // v88 v98
    // v89 v99
    for(int i = 0; i < Global::cloth_rows-1; i++){
        for(int j = 0; j < Global::cloth_cols; j++){
            vertical_structural_springs[i][j] = Spring(spring_stiffness, spring_rest_len, &this->cloth_vertices[i][j], &this->cloth_vertices[i+1][j]);
        }
    }

    for(int i = 0; i < Global::cloth_rows-3; i++){
        for(int j = 0; j < Global::cloth_cols; j++){
            vertical_bend_springs[i][j] = Spring(0.05 * spring_stiffness, 3 * spring_rest_len, &this->cloth_vertices[i][j], &this->cloth_vertices[i+3][j]);
        }
    }
    // v00 v11
    // v01 v12
    // v02 v13
    // ...
    // v88 v99
    //
    // v10 v01
    // v11 v02
    // v12 v03
    // ...
    // v98 v89
    //
    for(int i = 0; i < Global::cloth_rows-1; i++){
        for(int j = 0; j < Global::cloth_cols-1; j++){
            falling_shear_springs[i][j] = Spring(0.1 * spring_stiffness, spring_rest_len * sqrt(2.0), &this->cloth_vertices[i][j], &this->cloth_vertices[i+1][j+1]);
            rising_shear_springs[i][j] = Spring(0.1 * spring_stiffness, spring_rest_len * sqrt(2.0), &this->cloth_vertices[i+1][j], &this->cloth_vertices[i][j+1]);
        }
    }
}

void ClothHandler::CalculateVertexNextPos(float delta_t){

    for(int i = 0; i < Global::cloth_rows; i++){
        for(int j = 0; j < Global::cloth_cols; j++){
            this->cloth_vertices[i][j].ResetForce();
        }
    }

    for(int i = 0; i < Global::cloth_rows; i++){
        for(int j = 0; j < Global::cloth_cols-1; j++){
            this->horizontal_structural_springs[i][j].AddForce(delta_t);
        }
    }

    for(int i = 0; i < Global::cloth_rows; i++){
        for(int j = 0; j < Global::cloth_cols-3; j++){
            this->horizontal_bend_springs[i][j].AddForce(delta_t);
        }
    }

    for(int i = 0; i < Global::cloth_rows-1; i++){
        for(int j = 0; j < Global::cloth_cols; j++){
            this->vertical_structural_springs[i][j].AddForce(delta_t);
        }
    }

    for(int i = 0; i < Global::cloth_rows-3; i++){
        for(int j = 0; j < Global::cloth_cols; j++){
            this->vertical_bend_springs[i][j].AddForce(delta_t);
        }
    }

    for(int i = 0; i < Global::cloth_rows-1; i++){
        for(int j = 0; j < Global::cloth_cols-1; j++){
            this->falling_shear_springs[i][j].AddForce(delta_t);
            this->rising_shear_springs[i][j].AddForce(delta_t);
        }
    }

    for(int i = 0; i < Global::cloth_rows; i++){
        for(int j = 0; j < Global::cloth_cols; j++){
            this->cloth_vertices[i][j].CalculateNextPos(delta_t);
        }
    }
}

void ClothHandler::UpdateVertexPositions(){

    for(int i = 0; i < Global::cloth_rows; i++){
        for(int j = 0; j < Global::cloth_cols; j++){
            this->cloth_vertices[i][j].UpdatePos();
        }
    }
}

void ClothHandler::UpdateVertexNormals(){

    glm::vec3 v1;
    glm::vec3 v2;

    glm::vec3 normal;

    for(int i = 1; i < Global::cloth_rows - 1; i++){
        for(int j = 1; j < Global::cloth_cols - 1; j++){

            glm::vec3 curr_ver_pos = this->cloth_vertices[i][j].position;

            v1 = this->cloth_vertices[i-1][j].position - curr_ver_pos;
            v2 = this->cloth_vertices[i-1][j-1].position - curr_ver_pos;
            normal = glm::normalize(glm::cross(v1, v2));
            this->cloth_vertices[i][j].normal += normal;
            this->cloth_vertices[i-1][j].normal += normal;
            this->cloth_vertices[i-1][j-1].normal += normal;

            v1 = v2;
            v2 = this->cloth_vertices[i][j-1].position - curr_ver_pos;
            normal = glm::normalize(glm::cross(v1, v2));
            this->cloth_vertices[i][j].normal += normal;
            this->cloth_vertices[i][j-1].normal += normal;
            this->cloth_vertices[i-1][j-1].normal += normal;

            v1 = v2;
            v2 = this->cloth_vertices[i+1][j-1].position - curr_ver_pos;
            normal = glm::normalize(glm::cross(v1, v2));
            this->cloth_vertices[i][j].normal += normal;
            this->cloth_vertices[i][j-1].normal += normal;
            this->cloth_vertices[i+1][j-1].normal += normal;

            v1 = v2;
            v2 = this->cloth_vertices[i+1][j].position - curr_ver_pos;
            normal = glm::normalize(glm::cross(v1, v2));
            this->cloth_vertices[i][j].normal += normal;
            this->cloth_vertices[i+1][j].normal += normal;
            this->cloth_vertices[i+1][j-1].normal += normal;

            v1 = v2;
            v2 = this->cloth_vertices[i+1][j+1].position - curr_ver_pos;
            normal = glm::normalize(glm::cross(v1, v2));
            this->cloth_vertices[i][j].normal += normal;
            this->cloth_vertices[i+1][j].normal += normal;
            this->cloth_vertices[i+1][j+1].normal += normal;

            v1 = v2;
            v2 = this->cloth_vertices[i][j+1].position - curr_ver_pos;
            normal = glm::normalize(glm::cross(v1, v2));
            this->cloth_vertices[i][j].normal += normal;
            this->cloth_vertices[i][j+1].normal += normal;
            this->cloth_vertices[i+1][j+1].normal += normal;

            v1 = v2;
            v2 = this->cloth_vertices[i-1][j+1].position - curr_ver_pos;
            normal = glm::normalize(glm::cross(v1, v2));
            this->cloth_vertices[i][j].normal += normal;
            this->cloth_vertices[i][j+1].normal += normal;
            this->cloth_vertices[i-1][j+1].normal += normal;

            v1 = v2;
            v2 = this->cloth_vertices[i-1][j].position - curr_ver_pos;
            normal = glm::normalize(glm::cross(v1, v2));
            this->cloth_vertices[i][j].normal += normal;
            this->cloth_vertices[i-1][j].normal += normal;
            this->cloth_vertices[i-1][j+1].normal += normal;
        }
    }

    for(int i = 0; i < Global::cloth_rows; i++){
        for(int j = 0; j < Global::cloth_cols; j++){
            this->cloth_vertices[i][j].normal = glm::normalize(this->cloth_vertices[i][j].normal);
        }
    }

}

void ClothHandler::PinVertices(glm::vec2 v1, glm::vec2 v2){
    this->cloth_vertices[(int)v1.x][(int)v1.y].is_pinned = true;
    this->cloth_vertices[(int)v2.x][(int)v2.y].is_pinned = true;
}