正确处理 3D 空间中的对象和灯光 - OpenGL

发布于 2024-12-21 08:49:42 字数 947 浏览 2 评论 0原文

我正在尝试使用我的引擎启动并运行所有内容，但无法确定添加对象和灯光的顺序以使所有内容正确渲染。

我在初始化中设置了投影和模型视图矩阵：

glMatrixMode(GL_PROJECTION);
glLoadIdentity();                            

gluPerspective(75.0f,(GLfloat)width/(GLfloat)height, 0.1f , 1000.0f);

glMatrixMode(GL_MODELVIEW);                         
glLoadIdentity();

然后，当我渲染几何图形时，我清除缓冲区并加载单位矩阵并更新我的相机。

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();

// Camera updates
glRotatef(camera.anglePitch, 1.0f, 0.0f, 0.0f);
glRotatef(camera.angleYaw, 0.0f, 1.0f, 0.0f);
glTranslatef(-camera.position.x, -camera.position.y, -camera.position.z);

// Now render
level.render();

我对关卡的看法是一个相机，我收集的是四处移动的眼睛坐标。我正在尝试在我的关卡中渲染对象和灯光，并让它们显示在正确的位置。

我需要在世界上的特定点添加对象。例如，位于 (10, 10, 25) 的圆环。在渲染此环面对象之前，我需要做些什么才能使它们在 10、10、25 处正确显示？例如，我需要渲染然后翻译它们吗？

另外，第 2 部分与灯光有关。这几乎是同一个问题。当渲染 50、50、50 的灯光时，我必须考虑什么？我可以正常定位灯光还是需要再次将其平移到那里？还是我想多了？

原文

I am trying to get everything up and running with my engine but am having trouble figuring out what order to add objects and lights to get everything rendered correctly.

I set up my projection and modelview matrix in my itialization:

glMatrixMode(GL_PROJECTION);
glLoadIdentity();                            

gluPerspective(75.0f,(GLfloat)width/(GLfloat)height, 0.1f , 1000.0f);

glMatrixMode(GL_MODELVIEW);                         
glLoadIdentity();

Then, when I am rendering geometry, I clear the buffer and load the identity matrix and update my camera.

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();

// Camera updates
glRotatef(camera.anglePitch, 1.0f, 0.0f, 0.0f);
glRotatef(camera.angleYaw, 0.0f, 1.0f, 0.0f);
glTranslatef(-camera.position.x, -camera.position.y, -camera.position.z);

// Now render
level.render();

My view of my level is a camera, which I gather is eye coordinates moving around. I am trying to render objects and lights in my level and have them show up in the correct places.

I need to add the objects at specific points in the world. For instance, a torus at (10, 10, 25). Is there anything I need to do before I render this torus objects that will make them appear correctly at 10, 10, 25? Do I need to render and then translate them for instance?

Also, part 2 has to do with lights. It is pretty much the same question. What consideration do I have to have when rendering say a light at 50, 50, 50? Can I just position the light normally or do again do I have to translate it to there? Or am I over thinking this?

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