void quatRotate(Quaternion *q, Quaternion *v, Quaternion *result) {
if(q == NULL || v == NULL || result == NULL) { return; }
Quaternion temp;
quatConj(q, &temp);
quatMult(q, v, result);
quatMult(result, &temp, result);
}
void rateProcess(void) {
Quaternion current_ref;
if(!is_ready || !is_running) { return; }
rgltrGetQuatRef(¤t_ref);
// q_body*q_current*q_global
quatMult(&global_displacement, ¤t_ref, ¤t_ref);
quatMult(¤t_ref, &body_displacement, ¤t_ref);
quatNormalize(¤t_ref);
rgltrSetQuatRef(¤t_ref);
}
// qtarget = qcurr*qdisp
// qcurr'*qtarget = qdisp
void slewProcess(Quaternion *input, Quaternion *output) {
Quaternion conjugate, displacement;
bams32_t input_angle, limited_angle;
float sin_input, sin_limited, scale;
if(!is_ready || !is_running || max_angular_displacement == 0) {
quatCopy(output, input);
return;
}
// Calculate displacement
quatConj(&prev_ref, &conjugate);
quatMult(&conjugate, input, &displacement);
// Calculate displacement magnitude
input_angle = bams16ToBams32(bams16Acos(displacement.w)*2);
if(input_angle == 0) { // Check for no displacement case
quatCopy(output, input);
return;
}
sin_input = bams32Sin(input_angle/2);
// Apply displacement limits
if(input_angle > max_angular_displacement) {
limited_angle = max_angular_displacement;
} else if(input_angle < -max_angular_displacement) {
limited_angle = -max_angular_displacement;
} else {
limited_angle = input_angle;
}
sin_limited = bams32SinFine(limited_angle/2);
scale = sin_limited/sin_input;
displacement.w = bams32CosFine(limited_angle/2);
displacement.x = displacement.x*scale;
displacement.y = displacement.y*scale;
displacement.z = displacement.z*scale;
// Apply limited displacement
quatMult(&prev_ref, &displacement, output);
quatNormalize(output);
quatCopy(&prev_ref, output);
}
void rateApplyLocalRotation(Quaternion *rot) {
Quaternion current_ref;
rgltrGetQuatRef(¤t_ref);
quatMult(¤t_ref, rot, ¤t_ref);
quatNormalize(¤t_ref);
rgltrSetQuatRef(¤t_ref);
}
// 12000 cycles?
void attEstimatePose(void) {
Quaternion displacement_quat;
float rate[3], norm, sina_2;
bams32_t a_2;
if(!is_ready) { return; }
if(!is_running) { return; }
gyroGetRadXYZ(rate); // Get last read gyro values
timestamp = swatchToc(); // Record timestamp
// Calculate magnitude and disiplacement
norm = sqrtf(rate[0]*rate[0] + rate[1]*rate[1] + rate[2]*rate[2]);
// Special case when no movement occurs due to simplification below
if(norm == 0.0) {
displacement_quat.w = 1.0;
displacement_quat.x = 0.0;
displacement_quat.y = 0.0;
displacement_quat.z = 0.0;
} else {
// Generate displacement rotation quaternion
// Normally this is w = cos(a/2), but we can delay normalizing
// by multiplying all terms by norm
a_2 = floatToBams32Rad(norm*sample_period)/2;
sina_2 = bams32SinFine(a_2);
displacement_quat.w = bams32CosFine(a_2)*norm;
displacement_quat.x = sina_2*rate[0];
displacement_quat.y = sina_2*rate[1];
displacement_quat.z = sina_2*rate[2];
quatNormalize(&displacement_quat);
}
// Apply displacement to pose
quatMult(&pose_quat, &displacement_quat, &pose_quat);
// Normalize pose quaternion to account for unnormalized displacement quaternion
quatNormalize(&pose_quat);
calculateEulerAngles();
}
vec4d vec4d::quatDiv(vec4d x) {
return quatMult(x.quatConj()) * (1 / x.sqnorm());
}
void main(void)\n\
{ \n\
float fTime0_X = parameters[0][0];\n\
vec4 coreSeed = parameters[1];\n\
\n\
vec3 rayDir = normalize(objectPosition * vec3(1.0, 0.6, 1.0));\n\
vec3 camPos = vec3(0.0, 0.0, -parameters[0][1]);\n\
\n\
// rotate camera around y axis\n\
float alpha = parameters[0][2] * 4.5f;\n\
camPos.xz = vec2(cos(alpha)*camPos.x - sin(alpha)*camPos.z,\n\
sin(alpha)*camPos.x + cos(alpha)*camPos.z);\n\
rayDir.xz = vec2(cos(alpha)*rayDir.x - sin(alpha)*rayDir.z,\n\
sin(alpha)*rayDir.x + cos(alpha)*rayDir.z);\n\
\n\
vec3 rayPos = camPos;\n\
float sceneSize = 8.0;\n\
vec3 totalColor = vec3(0.);\n\
float stepSize;\n\
float totalDensity = 0.0;\n\
float stepDepth = 0.0; // how far I went already.\n\
\n\
for(int step = 0; length(rayPos)<sceneSize && totalDensity < 0.9 && step < 50; step++)\n\
{ \n\
float implicitVal;\n\
\n\
// This stuff is the transformation information from previous stuff\n\
float transer = parameters[0][3];\n\
vec4 prevQuaternion = vec4(cos(transer), sin(transer), sin(transer * 1.3), sin(transer * 2.7));\n\
prevQuaternion = normalize(prevQuaternion);\n\
float prevLength = 1.0;\n\
vec3 prevMover = vec3(0.0);\n\
vec3 prevColor = vec3(1.0, 0.4, 0.2);\n\
\n\
// Multiple boxes\n\
implicitVal = 1.0e10;\n\
\n\
for (int loop = 0; loop < 12; loop++)\n\
{\n\
vec4 newQuaternion;\n\
float newLength;\n\
vec3 newMover;\n\
vec3 newColor;\n\
\n\
mat3 prevRotationMatrix = quaternionToMatrix(prevQuaternion);\n\
\n\
// Loop for solid stuff\n\
vec4 seed = coreSeed;\n\
for (int k = 0; k < 4; k++)\n\
{\n\
seed = randomIteration(seed);\n\
vec4 quaternion = normalize(seed - vec4(0.5));\n\
mat3 rotationMatrix = quaternionToMatrix(quatMult(quaternion, prevQuaternion));\n\
vec3 lengthes = seed.xyz * seed.xyz * seed.xyz * seed.xyz * vec3(0.2) + vec3(0.05);\n\
lengthes *= prevLength;\n\
vec3 mover = 0.5*seed.wzx - vec3(0.25);\n\
mover = (mover * prevRotationMatrix * prevLength) + prevMover;\n\
float curImplicitVal = getDistance(rotationMatrix, lengthes, mover, rayPos);\n\
implicitVal = min(implicitVal, curImplicitVal);\n\
}\n\
\n\
// Non-solid:\n\
float nonSolidDist = 1.0e10;\n\
for (int k = 0; k < 2; k++)\n\
{\n\
seed = randomIteration(seed);\n\
vec4 quaternion = normalize(seed - vec4(0.5));\n\
quaternion = quatMult(quaternion, prevQuaternion);\n\
vec3 lengthes = seed.xyz * vec3(0.3) + vec3(0.25);\n\
lengthes *= prevLength;\n\
vec3 mover = 0.5*seed.wzx - vec3(0.25);\n\
mover = (mover * prevRotationMatrix * prevLength) + prevMover;\n\
float curImplicitVal = getSphereDistance(lengthes.x, mover, rayPos);\n\
if (curImplicitVal < nonSolidDist)\n\
{\n\
nonSolidDist = curImplicitVal;\n\
newQuaternion = quaternion;\n\
newLength = lengthes.x;\n\
newMover = mover;\n\
newColor = seed.xyz;\n\
}\n\
}\n\
\n\
if (nonSolidDist > implicitVal)\n\
{\n\
// I will not get closer than where I am now.\n\
break;\n\
}\n\
else\n\
{\n\
prevQuaternion = newQuaternion;\n\
prevLength = newLength;\n\
prevMover = newMover;\n\
prevColor = 0.5 * prevColor + 0.5 * newColor; \n\
}\n\
}\n\
\n\
// I need to do this distance related to for the DOF! \n\
totalColor += vec3(1./50., 1./70., 1./90.) *\n\
1.7 / exp(abs(implicitVal*5.) + 0.0) * 1.8;\n\
totalDensity += 1./ 15. / exp(abs(implicitVal*10.0) + 0.5);\n\
// *(1.0 - cos(fTime0_X*3.)*0.5);\n\
//if (implicitVal < 0.0)\n\
stepDepth += abs(implicitVal) * 0.95; \n\
{\n\
// TODO: I could make this distance-related, with offset to get the size right?\n\
float localDensity = implicitVal < 0.0 ? 1.0 : 0.0;\n\
totalColor = totalColor + (1.-totalDensity) * prevColor * localDensity;\n\
totalDensity = totalDensity + (1.05-totalDensity) * localDensity;\n\
}\n\
\n\
stepSize = abs(implicitVal) * 0.99;\n\
stepSize = max(0.005 * stepDepth, stepSize);\n\
rayPos += rayDir * stepSize;\n\
}\n\
\n\
float grad = normalize(rayDir).y;\n\
totalColor += (1.-totalDensity) * (grad * vec3(0.0,-0.4,-0.3) + (1.-grad)*vec3(0.0,0.4,0.6));\n\
\n\
gl_FragColor = vec4(totalColor-vec3(0.0), 1.0);\n\
}\n\
