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Normals to hide faces with shading

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Co-authored-by: sigonasr2 <sigonasr2@gmail.com>
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sigonasr2 2022-10-09 06:29:10 -05:00
parent 90093ef258
commit b9bb57d67a
2 changed files with 17 additions and 3 deletions
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C++ProjectTemplate
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20
main.cpp
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@ -37,6 +37,8 @@ private:
mesh meshCube; mesh meshCube;
mat4x4 matProj; mat4x4 matProj;
vec3d vCamera={0,0,0};
float fTheta=0; float fTheta=0;
void MultiplyMatrixVector(vec3d &i, vec3d &o, mat4x4 &m) void MultiplyMatrixVector(vec3d &i, vec3d &o, mat4x4 &m)
@ -158,7 +160,19 @@ public:
float l = sqrtf(normal.x*normal.x+normal.y*normal.y+normal.z*normal.z); float l = sqrtf(normal.x*normal.x+normal.y*normal.y+normal.z*normal.z);
normal.x/=l;normal.y/=l;normal.z/=l; normal.x/=l;normal.y/=l;normal.z/=l;
if (normal.z<0) { if (normal.x*(triTranslated.p[0].x-vCamera.x)+
normal.y*(triTranslated.p[0].y-vCamera.y)+
normal.z*(triTranslated.p[0].z-vCamera.z)<0) {
vec3d light_dir = {0,0,-1};
float l = sqrtf(light_dir.x*light_dir.x+light_dir.y*light_dir.y+light_dir.z*light_dir.z);
light_dir.x/=l;light_dir.y/=l;light_dir.z/=l;
float dp = normal.x*(light_dir.x-vCamera.x)+
normal.y*(light_dir.y-vCamera.y)+
normal.z*(light_dir.z-vCamera.z);
// Project triangles from 3D --> 2D // Project triangles from 3D --> 2D
MultiplyMatrixVector(triTranslated.p[0], triProjected.p[0], matProj); MultiplyMatrixVector(triTranslated.p[0], triProjected.p[0], matProj);
MultiplyMatrixVector(triTranslated.p[1], triProjected.p[1], matProj); MultiplyMatrixVector(triTranslated.p[1], triProjected.p[1], matProj);
@ -176,7 +190,7 @@ public:
triProjected.p[2].y *= 0.5f * (float)ScreenHeight(); triProjected.p[2].y *= 0.5f * (float)ScreenHeight();
// Rasterize triangle // Rasterize triangle
SetDecalMode(DecalMode::WIREFRAME); //SetDecalMode(DecalMode::WIREFRAME);
DrawPolygonDecal(nullptr,{ DrawPolygonDecal(nullptr,{
{triProjected.p[0].x, triProjected.p[0].y}, {triProjected.p[0].x, triProjected.p[0].y},
{triProjected.p[1].x, triProjected.p[1].y}, {triProjected.p[1].x, triProjected.p[1].y},
@ -185,7 +199,7 @@ public:
{0,0}, {0,0},
{0,0}, {0,0},
{0,0}, {0,0},
}); },Pixel(255*dp*dp,255*dp*dp,255*dp*dp));
} }
} }