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Hannes Högni Vilhjálmsson
hannes@ru.is
T H E I L L U S I O N
- “Virtual reality works
The Illusion of Reality Hannes Hgni Vilhjlmsson hannes@ru.is T H E - - PowerPoint PPT Presentation
The Illusion of Reality Hannes Hgni Vilhjlmsson hannes@ru.is T H E - - PowerPoint PPT Presentation
The Illusion of Reality Hannes Hgni Vilhjlmsson hannes@ru.is T H E I L L U S I O N Virtual reality works because reality is virtual Lawrence Stark, UC Berkeley T H E I L L U S I O N We experience a high-resolution
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T H E I L L U S I O N
- We experience a high-resolution spatial
and temporal continuum when we look around the 3D environment we are in.
- This is an illusion!
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T H E I L L U S I O N
- The retinal image of the visual field is in
focus only in a very small area: The fovea.
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T H E I L L U S I O N
- We need to sample the visual field, with
saccades and fixations (~3 per sec.) to construct an image.
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what we see and scanpaths to „see“ more
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T H E I L L U S I O N
- Sampled information is relatively sparse
when you walk into a room. You see the typical things and think you have seen the whole room.
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T H E I L L U S I O N
- You can change the way that you see by
changing perceptual filters.
- For example: “I want to see squares”...
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“I want to see squares”
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“I want to see circles”
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T H E I L L U S I O N
- Fixating ~90 % of the time.
- Checking and rechecking points of
interest, as if gathering support for what we think we are seeing.
- It is hard to overcome strong
presuppositions, such as what a room looks like...
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... or what a vase looks like
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T H E I L L U S I O N
- We see what is in our mind’s eye, and use
sampled visual information to verify this.
- The scanpath is driven by our mental
- model. Change the model and the
scanpath changes.
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T H E I L L U S I O N
- Our model can even make us see things
that we don’t have any sensory data for!
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T H E I L L U S I O N
- That’s a good thing, because we are
actually missing some data...
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T H E I L L U S I O N
- Can you find your blind spot?
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T H E I L L U S I O N
- Information is integrated across
neighboring areas.
- It’s image processing!
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THE ILLUSION OF 3D WORLDS
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3 D W O R L D S
- How do we perceive immersion in a 3D
environment?
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3 D W O R L D S
- How do we perceive immersion in a 3D
environment?
– Physiological cues – Stereoscopic cues – Static cues – Motion cues
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convergence
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accomodation
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3 D W O R L D S
- How do we perceive immersion in a 3D
environment?
– Physiological cues – Stereoscopic cues – Static cues – Motion cues
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stereopsis
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3 D W O R L D S
- How do we perceive immersion in a 3D
environment?
– Physiological cues – Stereoscopic cues – Static cues – Motion cues
But even if we close one eye we see the world in 3D – how can that be? (also on TV etc.)
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3 D W O R L D S
- How do we perceive immersion in a 3D
environment?
– Physiological cues – Stereoscopic cues – Static cues – Motion cues
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interposition / occlusion
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shading
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shading
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shading
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brightness / lighting / color
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size
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linear perspective
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texture gradient
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3 D W O R L D S
- How do we perceive immersion in a 3D
environment?
– Physiological cues – Stereoscopic cues – Static cues – Motion cues
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motion parallax / head parallax
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3 D W O R L D S
- How do we perceive immersion in a 3D
environment?
– Physiological cues – Stereoscopic cues – Static cues – Motion cues
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3 D W O R L D S
- To sum up - Paint the 3D world into the
mind of the receiver:
– Build a mental model with expected behavior. – Address the expectations. – Avoid contradictions. – Build layers of strong consistent cues.
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spot the cues?
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spot the cues?
size
- cclusion
shadows color texture gradient linear perspective
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Other interesting pictures...
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