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有一个问题,也许有人可以帮助我。 我想使用OpenGL制作镜面效果。我画了一个透明的飞机,一个由模具切割的“反射”场景,以及一个原始的飞机。 但我有一个完全不透明的“墙”而不是镜子。我知道这是因为第一次镜像平面渲染(获取模板缓冲区)。但我不知道该怎么做这个:( 下面是代码:混合问题(OpenGL)
void CMirror::draw(CSceneObject * curscene)
{
glPushMatrix();
glClearStencil(0.0f);
glClear(GL_STENCIL_BUFFER_BIT);
//Draw into the stencil buffer
glDisable(GL_LIGHTING);
glDisable(GL_TEXTURE_2D);
glStencilFunc(GL_ALWAYS, 1, 0);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glEnable(GL_STENCIL_TEST);
glPushMatrix();
glTranslatef(this->coords[0], this->coords[1], this->coords[2]);
glScalef(this->size, this->size, this->size);
glColor4f(1, 0, 1, 0);
glBegin(GL_QUADS);
glVertex3f(0.0f, this->height/2.0f, this->width/2.0f);
glVertex3f(0.0f, this->height/-2.0f, this->width/2.0f);
glVertex3f(0.0f, this->height/-2.0f, this->width/-2.0f);
glVertex3f(0.0f, this->height/2.0f, this->width/-2.0f);
glEnd();
glPopMatrix();
glDisable(GL_STENCIL_TEST);
glEnable(GL_LIGHTING);
glEnable(GL_TEXTURE_2D);
//glClear(GL_COLOR_BUFFER_BIT);
//Draw the scene
glEnable(GL_STENCIL_TEST);
glStencilFunc(GL_EQUAL, 1, 255);
glPushMatrix();
glTranslatef(2*this->coords[0], 2*this->coords[1], 2*this->coords[2]);
glScalef(-1.0f, 1.0f, 1.0f);
((CScene*)curscene)->draw();
glColor4f(0.0f, 0.30f, 0, 0.9);
((CScene*)curscene)->spline->draw();
((CScene*)curscene)->morph->draw();
glPopMatrix();
glDisable(GL_STENCIL_TEST);
//the mirror itself:
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
glPushMatrix();
glTranslatef(this->coords[0], this->coords[1], this->coords[2]);
glScalef(this->size, this->size, this->size);
glColor4f(0, 0, 0, 0.9);
glBegin(GL_QUADS);
glVertex3f(0.0f, this->height/2.0f, this->width/2.0f);
glVertex3f(0.0f, this->height/-2.0f, this->width/2.0f);
glVertex3f(0.0f, this->height/-2.0f, this->width/-2.0f);
glVertex3f(0.0f, this->height/2.0f, this->width/-2.0f);
glEnd();
glPopMatrix();
glDisable(GL_BLEND);
glPopMatrix();
}
Bahbar,谢谢! glClear(GL_DEPTH_BUFFER_BIT)工作:))我删除了最后一个画,它真的没有意义:)) – Irene 2009-11-27 14:55:54