#version 3.7;

global_settings {
  assumed_gamma 1.0
  max_trace_level 8
}

background { color rgb <0.98, 0.98, 1.00> }

// Camera
camera {
  location  <0, 1.3, -4.2>
  look_at   <0, 0.25, 0>
  angle 35
}

// Warm, soft lights
light_source {
  <3.5, 5.0, -3.0>
  color rgb <1.00, 0.92, 0.80>*1.15
  area_light <1.2,0,0>, <0,0,1.2>, 5, 5
  adaptive 1
  jitter
}

light_source {
  <-4.0, 4.2, -2.0>
  color rgb <1.00, 0.90, 0.75>*0.75
  area_light <1.0,0,0>, <0,0,1.0>, 5, 5
  adaptive 1
  jitter
}

// Soft ambient fill
light_source {
  <0, 6, 0>
  color rgb <1.0, 0.95, 0.90>*0.25
  shadowless
}

// Ground
plane {
  y, -1.05
  pigment { color rgb <0.96, 0.95, 0.94> }
  finish  { diffuse 0.85 specular 0.05 roughness 0.12 }
}

// Heart from equation: x^2 + ( (5y/4) - sqrt(|x|) )^2 = 1
// Build as an isosurface with small Z thickness via + (z/t)^2
#declare HeartScale = 1.35;
#declare Thickness  = 0.25;

isosurface {
  function {
    // f(x,y,z)=0 surface:
    // x^2 + ((5y/4)-sqrt(|x|))^2 + (z/t)^2 - 1 = 0
    pow(x,2)
    + pow( (5*y/4) - sqrt(abs(x)), 2 )
    + pow( z/Thickness, 2 )
    - 1
  }
  contained_by { box { <-1.4, -1.4, -0.5>, <1.4, 1.4, 0.5> } }
  threshold 0
  accuracy 0.001
  max_gradient 6
  all_intersections

  pigment { color rgb <0.86, 0.12, 0.20> }
  finish  { diffuse 0.75 specular 0.25 roughness 0.04 }

  // Positioning: scale and lift slightly above ground
  scale HeartScale
  translate <0, 0.15, 0>
}