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Calypso

accum buffer

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First, I was reading through the chapter on buffers in "OpenGL Game Programming" by Hawkins and Astle, and got past the part where he talked about the accumulation buffer. He gave a quick example of how to use it for motion blur, and I tried to put this into effect on Nehe Lesson 6. Here''s the code: int DrawGLScene(GLvoid) // Here''s Where We Do All The Drawing { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_ACCUM_BUFFER_BIT); // Clear The Screen And The Depth Buffer glLoadIdentity(); // Reset The View glTranslatef(0.0f,0.0f,-5.0f); DrawCube(); glAccum(GL_LOAD,0.7); for(idx=1;idx<5;idx++) { glRotatef(objectAngle - (float)idx,0.0,1.0,0.0); DrawCube(); glAccum(GL_ACCUM,0.2); } glAccum(GL_RETURN,1.0); return TRUE; // Keep Going } Now, it just creates a slightly blurred, discolored cube that doesn''t move and slows down the program. Any idea on how to get it actually moving with the motion blur? Second, I was compiling some of the programs from the Nvidia OpenGL sdk, and I get this linker error: error LNK2019: unresolved external symbol "void __cdecl std::_Xlen(void)" (?_Xlen@std@@YAXXZ) referenced in function "private: bool __thiscall std::basic_string,class std::allocator >::_Grow(unsigned int,bool)" (?_Grow@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AAE_NI_N@Z) What library am I forgetting to link? Thanks
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I don''t know much about accumulation buffers except that they are software so don''t expect any speed in your app.

The fanatic is incorruptible: if he kills for an idea, he can just as well get himself killed for one; in either case, tyrant or martyr, he is a monster.
--EM Cioran

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Yeah, I just wanted to see if I could pull off that motion blur with it. There''s probably a faster way to do it, but I just want to get it working with the accum buffer.
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Where are you moving the cube? Maybe you should render a couple frames into the accumulation buffer in each DrawGLScene. Right now you don''t have any translating or rotating based on user input.

The fanatic is incorruptible: if he kills for an idea, he can just as well get himself killed for one; in either case, tyrant or martyr, he is a monster.
--EM Cioran

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