網格的邊界由其世界位置縮放

Question

我正在嘗試獲取網格的正確世界位置和邊界大小，但是邊界的大小由網格的位置縮放。

網格本身的邊界是正確的，但試圖讓它們進入世界空間是行不通的。

照片： 1和2

渲染邊界的代碼：

void MeshRenderer::drawBounds() // FIXME: world bounds are scaled by the transforms position
{
    glm::mat4 transformation = entity->transform.getTransformationMatrix();
    bounds.center = transformation * glm::vec4(m_Mesh.bounds.center, 1.0);
    bounds.size = transformation * glm::vec4(m_Mesh.bounds.size, 1.0);

    bounds.updateCornerVertices();
    bounds.draw();
}

void Bounds::updateCornerVertices()
{
    glm::vec3 halfSize = size * 0.5f;
    auto verts = GeomUtil::createLineCubeVertices(
        center + glm::vec3(-halfSize.x, halfSize.y, -halfSize.z),
        center + glm::vec3(-halfSize.x, -halfSize.y, -halfSize.z),
        center + glm::vec3(halfSize.x, -halfSize.y, -halfSize.z),
        center + glm::vec3(halfSize.x, halfSize.y, -halfSize.z),
        center + glm::vec3(-halfSize.x, halfSize.y, halfSize.z),
        center + glm::vec3(-halfSize.x, -halfSize.y, halfSize.z),
        center + glm::vec3(halfSize.x, -halfSize.y, halfSize.z),
        center + glm::vec3(halfSize.x, halfSize.y, halfSize.z));

    m_Vertexbuffer.setData(&verts[0], 48);
}
void Bounds::draw() const
{
    Renderer::shaderColor.use();
    Renderer::shaderColor.setMat4("_ModelMatrix", glm::mat4(1.0));
    m_Vertexbuffer.bind();
    glDrawArrays(GL_LINES, 0, 48);
    m_Vertexbuffer.unbind();
}

glm::mat4 Transform::getTransformationMatrix() const
{
    glm::mat4 matrix(1.0f);
    matrix = glm::translate(matrix, position);
    matrix = glm::scale(matrix, scale);
    matrix = glm::rotate(matrix, glm::radians(rotation.x), GeomUtil::X_AXIS); // TODO: Figure out how rotations work (quaternions)
    matrix = glm::rotate(matrix, glm::radians(rotation.y), GeomUtil::Y_AXIS);
    matrix = glm::rotate(matrix, glm::radians(rotation.z), GeomUtil::Z_AXIS);

    if (entity->parent)
        matrix = entity->parent->transform.getTransformationMatrix() * matrix;

    return matrix;
}

Answer 1

size是一個向量，但不是一個位置。 所以它必須是

bounds.size = transformation * glm::vec4(m_Mesh.bounds.size, 1.0);

bounds.size = transformation * glm::vec4(m_Mesh.bounds.size, 0.0);