如何使用P3D渲染器实现noSmooth()? [英] How can I achieve noSmooth() with the P3D renderer?

问题描述

我想使用P3D渲染器使用PGraphics实例渲染基本的3D形状而没有任何混淆/平滑，但是noSmooth()似乎不起作用.

I'd like to render basic 3D shapes without any aliasing/smoothing with a PGraphics instance using the P3D renderer, but noSmooth() doesn't seem to work.

在OF中，我记得在纹理上调用setTextureMinMagFilter(GL_NEAREST,GL_NEAREST);.

In OF I remember calling setTextureMinMagFilter(GL_NEAREST,GL_NEAREST); on a texture.

什么是处理中的等价物?

What would be the equivalent in Processing ?

我尝试使用 PGL :

PGL.TEXTURE_MIN_FILTER = PGL.NEAREST;
PGL.TEXTURE_MAG_FILTER = PGL.NEAREST;

但是我得到一个黑色图像. 如果我评论PGL.TEXTURE_MIN_FILTER = PGL.NEAREST;，我可以看到渲染，但是它是插值的，不是很清晰.

but I get a black image as the result. If I comment PGL.TEXTURE_MIN_FILTER = PGL.NEAREST; I can see the render, but it's interpolated, not sharp.

这是我尝试过的一些基本测试草图:

Here'a basic test sketch with a few things I've tried:

PGraphics buffer;
PGraphicsOpenGL pgl;

void setup() {
  size(320, 240, P3D);
  noSmooth();
  //hint(DISABLE_TEXTURE_MIPMAPS);

  //((PGraphicsOpenGL)g).textureSampling(0);

  //PGL pgl = beginPGL();
  //PGL.TEXTURE_MIN_FILTER = PGL.NEAREST;
  //PGL.TEXTURE_MAG_FILTER = PGL.NEAREST;
  //endPGL();

  buffer=createGraphics(width/8, height/8, P3D);
  buffer.noSmooth();
  buffer.beginDraw();
  //buffer.hint(DISABLE_TEXTURE_MIPMAPS);
  //((PGraphicsOpenGL)buffer).textureSampling(0);
  PGL bpgl = buffer.beginPGL();
  //PGL.TEXTURE_MIN_FILTER = PGL.NEAREST;//commenting this back in results in a blank buffer
  PGL.TEXTURE_MAG_FILTER = PGL.NEAREST;
  buffer.endPGL();
  buffer.background(0);
  buffer.stroke(255);
  buffer.line(0, 0, buffer.width, buffer.height);
  buffer.endDraw();
}
void draw() {

  image(buffer, 0, 0, width, height);
}

(我也发布在处理论坛上，但到目前为止还没有运气)

(I've also posted on the Processing Forum, but no luck so far)

推荐答案

您实际上是在正确的轨道上.您只是将错误的值传递给textureSampling().

You were actually on the right track. You were just passing the wrong value to textureSampling().

自 至少可以说有点稀缺. 我决定使用反编译器来深入研究它，这导致我 Texture::usingMipmaps() . 在那里，我能够看到这些值及其反映的内容(在反编译的代码中).

Since the documentation on PGraphicsOpenGL::textureSampling() is a bit scarce to say the least. I decided to peak into it using a decompiler, which lead me to Texture::usingMipmaps(). There I was able to see the values and what they reflected (in the decompiled code).

2 = POINT
3 = LINEAR
4 = BILINEAR
5 = TRILINEAR

PGraphicsOpenGL的默认textureSampling是5(TRILINEAR).

Where PGraphicsOpenGL's default textureSampling is 5 (TRILINEAR).

我后来也发现了关于问题的旧评论同样确认.

I also later found this old comment on an issue equally confirming it.

因此，要获取点/最近过滤，只需要在应用程序本身上调用noSmooth()，然后在PGraphics上调用textureSampling().

So to get point/nearest filtering you only need to call noSmooth() on the application itself, and call textureSampling() on your PGraphics.

size(320, 240, P3D);
noSmooth();

buffer = createGraphics(width/8, height/8, P3D);
((PGraphicsOpenGL) buffer).textureSampling(2);

因此，请考虑以上内容，并且仅包括用于绘制线条和为应用程序绘制buffer的代码.然后，得出以下预期结果.

So considering the above, and only including the code you used to draw the line and drawing buffer to the application. Then that gives the following desired result.

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