Question

我写了一条横跨屏幕的太阳游戏,但我对定位ube有问题。

页: 1 带一英寸:

void draw_voxel(Point location, Color color, GLKMatrixStackRef stack) {
  GLKMatrixStackPush(stack);
  GLKMatrixStackTranslate(stack, location.x, location.y, location.z);

  std::array<Color, 36> triangle_colors;
  triangle_colors.fill(color);

  glEnableVertexAttribArray(GLKVertexAttribPosition);
  glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, 0, static_cast<const GLvoid*>(triangle_vertices.data()));
  glEnableVertexAttribArray(GLKVertexAttribColor);
  glVertexAttribPointer(GLKVertexAttribColor, 4, GL_FLOAT, GL_FALSE, 0, static_cast<const GLvoid*>(triangle_colors.data()));
  glDrawArrays(GL_TRIANGLES, 0, 36);
  glDisableVertexAttribArray(GLKVertexAttribPosition);
  glDisableVertexAttribArray(GLKVertexAttribColor);

  GLKMatrixStackPop(stack);
}

我通过一个<代码>GLKMatrixStackRef,将目前的矩阵推向上并使用<代码>GLKMatrixStack Translate,以翻译最高矩阵。然而,所有河流仍在(0、0、0)。

页: 1 类似:

[self.effect prepareToDraw];

GLKMatrixStackRef stack = GLKMatrixStackCreate(nullptr);
draw_voxel(Point(-1.0f, 0.0f, 0.0f), Color(1.0f, 0.0f, 0.0f, 1.0f), stack);
draw_voxel(Point(+0.0f, 0.0f, 0.0f), Color(0.0f, 1.0f, 0.0f, 1.0f), stack);
draw_voxel(Point(+1.0f, 0.0f, 0.0f), Color(0.0f, 0.0f, 1.0f, 1.0f), stack);
CFRelease(stack);

我无法在互联网上找到任何有用的信息,了解GLKit矩阵的摇篮,我确实 st。我如何“应用”顶层矩阵,以翻译这些ube子?

Answer 1

While I still haven t fully grasp how to use GLKMatrixStack, looking at your code I think the problem is that you are not passing the top matrix of the stack to the shader, or, in GLKit words, you are not properly configuring the effect. Probably, at some point you should be doing something like:

self.effect.transform.modelviewMatrix = GLKMatrixStackGetMatrix4(stack);

我希望这一帮助,我也站在这个 st子上:

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