OpenGL |在UV坐标处渲染顶点 [英] OpenGL | Render Vertex at UV coordinate

问题描述

我正在使用OpenGL，需要在顶点的UV坐标下将3D模型的顶点渲染为FBO.为此，我首先必须将UV坐标空间转换为屏幕空间.

I'm using OpenGL and I need to render the vertecies of a 3D model to a FBO at the UV coordinate of the vertex. To do that, I first have to convert the UV coordinate space to the screen space.

我得出的结论是:

uv.x * 2 - 1
uv.y * 2 - 1

...应该可以解决问题.

…should do the trick.

我在顶点着色器中使用它来将顶点放置在这些新位置.结果看起来像这样:

I used that in my vertex shader to place the vertex at those new positions. The result looks like this:

…它应该看起来像这样:

…while it should should look like this:

似乎已扩大规模.我不知道问题出在哪里.

It seems like it's scaled up. I dont know where the problem is.

推荐答案

解决了该问题，我没有调用gl视口，这是坐标系未应用于fbo纹理大小的原因

Fixed the problem, I did not call gl viewport which was the reason the coordinate system wasn't applied to the fbo texture size

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