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HTML 

              
                .<div id="ship-interior">
  <div id="sarcophagus-viewport"
      v-on:mouseover="calculateThird, flashlightOn = true"
      v-on:mousemove="calculateThird"
      v-on:touchstart="calculateThird"
      v-on:touchmove="calculateThird"
      v-on:mouseleave="flashlightOff"
      v-on:touchend="flashlightOff"
      v-on:touchcancel="flashlightOff">
    <img id="face_bg" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_bg.jpg" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_bg2x.jpg 2x" alt=''>
    <transition name="flashlight">
      <img v-if="flashlightX === 'right' && flashlightY === 'bottom'" key="face_bot_r" class="face_shadow" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_bottom-right.png" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_bottom-right2x.png 2x" alt=''>
      <img v-else-if="flashlightX === 'center' && flashlightY === 'bottom'" key="face_bot_c" class="face_shadow" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_center-bottom.png" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_center-bottom2x.png 2x" alt=''>
      <img v-else-if="flashlightX === 'center' && flashlightY === 'middle'" key="face_mid_c" class="face_shadow" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_center-center.png" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_center-center2x.png 2x" alt=''>
      <img v-else-if="flashlightX === 'left' && flashlightY === 'middle'" key="face_mid_l" class="face_shadow" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_center-left.png" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_center-left2x.png 2x" alt=''>
      <img v-else-if="flashlightX === 'left' && flashlightY === 'bottom'" key="face_bot_l" class="face_shadow" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_left-bottom.png" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_left-bottom2x.png 2x" alt=''>
      <img v-else-if="flashlightX === 'right' && flashlightY === 'middle'" key="face_mid_r" class="face_shadow" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_right-center.png" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_right-center2x.png 2x" alt=''>
      <img v-else-if="flashlightX === 'center' && flashlightY === 'top'" key="face_top_c" class="face_shadow" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_top-center.png" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_top-center2x.png 2x" alt=''>
      <img v-else-if="flashlightX === 'left' && flashlightY === 'top'" key="face_top_l" class="face_shadow" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_top-left.png" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_top-left2x.png 2x" alt=''>
      <img v-else-if="flashlightX === 'right' && flashlightY === 'top'" key="face_top_r" class="face_shadow" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_top-right.png" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_top-right2x.png 2x" alt=''>
      <img v-else-if="flashlightX === undefined && flashlightY === undefined" key="face_dark" class="face_shadow" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_dark.png" srcset="https://s3-us-west-2.amazonaws.com/s.cdpn.io/641/vuety_face_dark2x.png 2x" alt=''>
    </transition>
    <div v-show="flashlightOn" id="flashlight_glow" v-bind:style="flashlightStyles"></div>
  </div>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Kalam|Nova+Mono');

#ship-interior {
  background: #000;
  width: 100%;
  max-width: calc(1366px / 2);
  height: 100vh;
  position: relative; 
  margin: 0 auto;  
}

body { background: black;}

/* The face */
#sarcophagus-viewport {
  box-shadow: 0px 20px 78px 0px rgba(0,0,0,1);
  border: #000 3px solid;
  border-radius: 50%;
  overflow: hidden;
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 512px; 
}

.face_shadow {
  position: absolute;
  top: 0; left: 0;
}

.flashlight-enter-active,
.flashlight-leave-active {
  transition: opacity 400ms;
}

.flashlight-enter {
  transition-timing-function: ease-out;  
}

.flashlight-leave-to {
  transition-timing-function: ease-out;  
}

.flashlight-enter, .flashlight-leave-to {
  opacity: 0;
}

/* special radial gradient using easing curve: https://larsenwork.com/easing-gradients/ */
#flashlight_glow {
  height: 200px; width: 200px;
  transform: translate(-50%, -50%);
  background: radial-gradient(closest-side, hsl(0, 0%, 100%) 0%, hsla(0, 0%, 100%, 0.933) 5.2%, hsla(0, 0%, 100%, 0.863) 10.1%, hsla(0, 0%, 100%, 0.792) 14.9%, hsla(0, 0%, 100%, 0.721) 19.7%, hsla(0, 0%, 100%, 0.651) 24.5%, hsla(0, 0%, 100%, 0.582) 29.5%, hsla(0, 0%, 100%, 0.515) 34.6%, hsla(0, 0%, 100%, 0.449) 40%, hsla(0, 0%, 100%, 0.386) 45.6%, hsla(0, 0%, 100%, 0.325) 51.5%, hsla(0, 0%, 100%, 0.266) 57.7%, hsla(0, 0%, 100%, 0.211) 64.2%, hsla(0, 0%, 100%, 0.16) 70.9%, hsla(0, 0%, 100%, 0.113) 77.9%, hsla(0, 0%, 100%, 0.07) 85.2%, hsla(0, 0%, 100%, 0.032) 92.7%, hsla(0, 0%, 100%, 0) 100%);
  position: absolute;
  pointer-events: none;
};
!

JS 

              
                "use strict";

const app = new Vue({
  el: "#ship-interior",
  data: { 
    flashlightX : undefined,
    flashlightY: undefined,
    flashlightOn: false,
    flashlightStyles : {
      top : undefined,
      left : undefined
    }
  },
  computed: {
  },
  methods : {
    calculateThird : function(event) {
      // mX/Y is the mouse's distance from the window's edges. 
      const mX = event.target.getBoundingClientRect().left + window.scrollX;
      const mY = event.target.getBoundingClientRect().top + window.scrollY;

      // coffinX/Y is the cursor's distance from the edges of the element we're listening on
      const coffinX = event.clientX - mX;
      const coffinY = event.clientY - mY;

      // elW/H are said element's width and height
      const elW = event.target.width;
      const elH = event.target.height;

      // if the cursor's distance from the edge of the element 
      // is less than 33% of the element's width
      if (coffinX < elW * .33 ) {
        // set data's flashlightX to left and so on
        this.flashlightX = "left";
      } else if (coffinX < elW *.66) {
        this.flashlightX = "center";
      } else {
        this.flashlightX = "right";
      }

      // if the cursor's distance from the edge of the element 
      // is less than 33% of the element's height
      if (coffinY < elH * .33 ) {
        // set data's flashlightY to top and so on
        this.flashlightY = "top";
      } else if (coffinY < elH *.66) {
        this.flashlightY = "middle";
      } else {
        this.flashlightY = "bottom";
      }
      
      this.flashlightStyles.top = coffinY + "px";
      this.flashlightStyles.left = coffinX + "px";
      // console.log( "Coffin: " + coffinX + " " + coffinY)
      // console.log( "Mouse position: " + mX + " " + mY)
      // console.log("Element's width: " + elW + " " + elH)
      // console.log (" ")

    },
    flashlightOff : function(event) {
      console.log("off")
      // reset all the coordinates for next time
      this.flashlightX = undefined;
      this.flashlightY = undefined;
      // this.flashlightStyles.top = undefined;
      // this.flashlightStyles.left = undefined;

      // and turn off flashlight
      this.flashlightOn = false;
    }
  }  
});
!
999px

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