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Camera Controls

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Co-authored-by: sigonasr2 <sigonasr2@gmail.com>
This commit is contained in:
sigonasr2 2022-10-10 00:33:15 -05:00
parent b2a0082a77
commit dc8e9c198c
2 changed files with 36 additions and 9 deletions
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C++ProjectTemplate
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main.cpp
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@ -120,10 +120,12 @@ private:
mat4x4 matProj; mat4x4 matProj;
vec3d vCamera={0,0,0}; vec3d vCamera={0,0,0};
vec3d vLookDir;
float zOffset=2; float zOffset=2;
float fTheta=0; float fTheta=0;
float fYaw=0;
vec3d Matrix_MultiplyVector(mat4x4 &m, vec3d &i) vec3d Matrix_MultiplyVector(mat4x4 &m, vec3d &i)
{ {
@ -313,16 +315,29 @@ public:
bool OnUserUpdate(float fElapsedTime) override bool OnUserUpdate(float fElapsedTime) override
{ {
if (GetKey(olc::DOWN).bHeld) { if (GetKey(olc::DOWN).bHeld) {
zOffset-=1*fElapsedTime; vCamera.y-=8*fElapsedTime;
} }
if (GetKey(olc::UP).bHeld) { if (GetKey(olc::UP).bHeld) {
zOffset+=1*fElapsedTime; vCamera.y+=8*fElapsedTime;
} }
if (GetKey(olc::RIGHT).bHeld) { if (GetKey(olc::RIGHT).bHeld) {
fTheta-=1*fElapsedTime; vCamera.x+=8*fElapsedTime;
} }
if (GetKey(olc::LEFT).bHeld) { if (GetKey(olc::LEFT).bHeld) {
fTheta+=1*fElapsedTime; vCamera.x-=8*fElapsedTime;
}
vec3d vForward=Vector_Mul(vLookDir,8*fElapsedTime);
if (GetKey(olc::W).bHeld) {
vCamera=Vector_Add(vCamera,vForward);
}
if (GetKey(olc::S).bHeld) {
vCamera=Vector_Sub(vCamera,vForward);
}
if (GetKey(olc::A).bHeld) {
fYaw+=2*fElapsedTime;
}
if (GetKey(olc::D).bHeld) {
fYaw-=2*fElapsedTime;
} }
// Set up rotation matrices // Set up rotation matrices
@ -336,12 +351,20 @@ public:
matWorld=Matrix_MultiplyMatrix(matRotZ,matRotX); matWorld=Matrix_MultiplyMatrix(matRotZ,matRotX);
matWorld=Matrix_MultiplyMatrix(matWorld,matTrans); matWorld=Matrix_MultiplyMatrix(matWorld,matTrans);
vec3d vUp={0,1,0};
vec3d vTarget={0,0,1};
mat4x4 matCameraRot=Matrix_MakeRotationY(fYaw);
vLookDir=Matrix_MultiplyVector(matCameraRot,vTarget);
vTarget=Vector_Add(vCamera,vLookDir);
mat4x4 matCamera = Matrix_PointAt(vCamera,vTarget,vUp);
mat4x4 matView=Matrix_QuickInverse(matCamera);
std::vector<triangle>vecTrianglesToRaster; std::vector<triangle>vecTrianglesToRaster;
// Draw Triangles // Draw Triangles
for (auto&tri : meshCube.tris) for (auto&tri : meshCube.tris)
{ {
triangle triProjected, triTransformed; triangle triProjected, triTransformed,triViewed;
triTransformed.p[0]=Matrix_MultiplyVector(matWorld,tri.p[0]); triTransformed.p[0]=Matrix_MultiplyVector(matWorld,tri.p[0]);
triTransformed.p[1]=Matrix_MultiplyVector(matWorld,tri.p[1]); triTransformed.p[1]=Matrix_MultiplyVector(matWorld,tri.p[1]);
@ -357,18 +380,22 @@ public:
vec3d vCameraRay=Vector_Sub(triTransformed.p[0],vCamera); vec3d vCameraRay=Vector_Sub(triTransformed.p[0],vCamera);
if (Vector_DotProduct(normal,vCameraRay)<0) { if (Vector_DotProduct(normal,vCameraRay)<0) {
vec3d light_dir={0,1,-1}; vec3d light_dir=Vector_Mul(vLookDir, -1);
light_dir=Vector_Normalise(light_dir); light_dir=Vector_Normalise(light_dir);
float dp = std::max(0.1f,Vector_DotProduct(light_dir,normal)); float dp = std::max(0.1f,Vector_DotProduct(light_dir,normal));
triTransformed.col=Pixel(255*dp*dp,255*dp*dp,255*dp*dp); triTransformed.col=Pixel(255*dp*dp,255*dp*dp,255*dp*dp);
triViewed.p[0]=Matrix_MultiplyVector(matView,triTransformed.p[0]);
triViewed.p[1]=Matrix_MultiplyVector(matView,triTransformed.p[1]);
triViewed.p[2]=Matrix_MultiplyVector(matView,triTransformed.p[2]);
// Project triangles from 3D --> 2D // Project triangles from 3D --> 2D
triProjected.p[0]=Matrix_MultiplyVector(matProj,triTransformed.p[0]); triProjected.p[0]=Matrix_MultiplyVector(matProj,triViewed.p[0]);
triProjected.p[1]=Matrix_MultiplyVector(matProj,triTransformed.p[1]); triProjected.p[1]=Matrix_MultiplyVector(matProj,triViewed.p[1]);
triProjected.p[2]=Matrix_MultiplyVector(matProj,triTransformed.p[2]); triProjected.p[2]=Matrix_MultiplyVector(matProj,triViewed.p[2]);
triProjected.p[0]=Vector_Div(triProjected.p[0],triProjected.p[0].w); triProjected.p[0]=Vector_Div(triProjected.p[0],triProjected.p[0].w);
triProjected.p[1]=Vector_Div(triProjected.p[1],triProjected.p[1].w); triProjected.p[1]=Vector_Div(triProjected.p[1],triProjected.p[1].w);
triProjected.p[2]=Vector_Div(triProjected.p[2],triProjected.p[2].w); triProjected.p[2]=Vector_Div(triProjected.p[2],triProjected.p[2].w);